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Discussion Starter · #1 ·
Hi all,
Ive have an issue with this engine getting noisy top end and at lifters once hot .
The oil pressure from cold is 20psi ( which seems low as it should be nearer 40psi ) but drops to zero unless revved hard once hot. It’s a new engine max 100 miles on it .
( 20 miles or after being warmed up for 15 mins then ridden 5 miles.
These engines have evo crank and external oil feeds to the STD heads. Lifter are like evo ones ( hydraulic)
oil filter is on a fitting which replaces the generator. ( checked filter isn’t the wrong type) and return to oil tank which seems good when running.
I’ve had the pump off and refitted , checked screen filter in case and even stretched the pressure spring after checking piston . Blew air ( manually ) up external feeds to head and heard it in rockers..

Any ideas or best of all a reason which I can fix.
Vulcan Engineering are impossible to get an answer from

Cheers all
CCS John - Scotland
 

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Sorry to hear this & I'm going to be no help at all really, but I too wanted buy one of these motors from Vulcan, but they just never replied to any of my emails when I enquired. In fairness S&S have never replied to any of my enquiries either.

It's really sad that these days of the internet & bearing in mind how easy it should be to reply to emails that companies just can't be bothered to reply, even just to say "yes, we've received your enquiry & we'll get back to you".

Normally I'd say take the motor back to the supplier or go vist them, but considering the distance involved here that's not an easy option.
I hope you do get you issue resolved, but by the sounnds of it & going off your description of your problem, it doesn't sound like an easy/quick fix.

What ignition are you running, not a G5 Morris magneto by any chance ?
These units have a spring mechanism in them that triggers to give a big spark at low revs & they make the engine sound very tappety, if that makes sense.
I have a S&S 93" Panhead with a G5 Morris fitted so I know what I mean !!

Also, what are you using to show the oil pressure, is it just a "normal" oil pressure switch or one of those small oil pressure gauges you can fit to these type engines ?
 

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Discussion Starter · #3 ·
Hi all,
Ive have an issue with this engine getting noisy top end and at lifters once hot .
The oil pressure from cold is 20psi ( which seems low as it should be nearer 40psi ) but drops to zero unless revved hard once hot. It’s a new engine max 100 miles on it .
( 20 miles or after being warmed up for 15 mins then ridden 5 miles.
These engines have evo crank and external oil feeds to the STD heads. Lifter are like evo ones ( hydraulic)
oil filter is on a fitting which replaces the generator. ( checked filter isn’t the wrong type) and return to oil tank which seems good when running.
I’ve had the pump off and refitted , checked screen filter in case and even stretched the pressure spring after checking piston . Blew air ( manually ) up external feeds to head and heard it in rockers..

Any ideas or best of all a reason which I can fix.
Vulcan Engineering are impossible to get an answer from

Cheers all
CCS John - Scotland
Sorry to hear this & I'm going to be no help at all really, but I too wanted buy one of these motors from Vulcan, but they just never replied to any of my emails when I enquired. In fairness S&S have never replied to any of my enquiries either.

It's really sad that these days of the internet & bearing in mind how easy it should be to reply to emails that companies just can't be bothered to reply, even just to say "yes, we've received your enquiry & we'll get back to you".

Normally I'd say take the motor back to the supplier or go vist them, but considering the distance involved here that's not an easy option.
I hope you do get you issue resolved, but by the sounnds of it & going off your description of your problem, it doesn't sound like an easy/quick fix.

What ignition are you running, not a G5 Morris magneto by any chance ?
These units have a spring mechanism in them that triggers to give a big spark at low revs & they make the engine sound very tappety, if that makes sense.
I have a S&S 93" Panhead with a G5 Morris fitted so I know what I mean !!

Also, what are you using to show the oil pressure, is it just a "normal" oil pressure switch or one of those small oil pressure gauges you can fit to these type engines ?
Hi Cat,
Thanks for replying , I wasn’t sure anyone could understand my accent by the lack of response 😂
to answer your questions
mag is as supplied by Vulcan
oil pressure gauge is there own , but replaced with oil pressure switch under advise from others.

im wondering if the oil way from pressure side is slightly over sized so when hot the oil flows to crack mainly rather than push to lifter blocks and rockers?

clutching at straws as I have no idea what Vulcan have done. Couple of mates over here have same engine and not had this with there’s..
frustrating is no where near where I’m at with it or Vulcan Engineering/ motorway
 

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I have both an oil pressure switch & a small pressure gauge on my engine. Is it worth swoping out both your existing parts with replacements just to be sure one of them is not faulty.
If you just have a pressure switch currently, does the low oil pressure light come on ?
What oil pump is on your engine, is it a S&S one ? Could you swop out the oil pump.

Obviously you don't want to be running the motor any more than you have to until you know for sure what the problem is.
 

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Discussion Starter · #5 ·
I have both an oil pressure switch & a small pressure gauge on my engine. Is it worth swoping out both your existing parts with replacements just to be sure one of them is not faulty.
If you just have a pressure switch currently, does the low oil pressure light come on ?
What oil pump is on your engine, is it a S&S one ? Could you swop out the oil pump.

Obviously you don't want to be running the motor any more than you have to until you know for sure what the problem is.
I was considering that but it’s the very obvious noise once hot.
The light, like gauge shows low pressure once hot .
oil pump is Vulcan’s own version, again this is what’s so frustrating about their lack of response to requests for help.
beautiful engine which looks so well engineered let down with shite customer service.
Mate in Scotland waited 2 years for engines he ordered and had paid for.
They finally turned up after he threatened to fly over personally to collect them and get compensation plus expenses.
 

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When I was building my first bobber I ordered an engine from an American shop with a good/high reputation. It took 21 months to arrive !!
In fairness it kind of suited me as I'd almost finished the build by the time it arrived !
They'd bought a brand new S&S P-Series motor, stripped it & powder coated it.
I was assured by other customers of theirs, (got a generic email from the builder apologising for the delay, which he'd obviously sent to all his customers. So, I emailed some of them & those that did reply said not to worry, I would get my engine, it will be good, but he's just bloody slow. Turned out to be good advice, but .... !!).

Having said that I since found out that S&S did a custom service where they would have supplied a gloss black 93" Panhead motor as a "special order".

I'm now build a second bobber & want to use the same motor for this one, but trying to get a reply from S&S when I've asked if they still offer this service has so far proved impossible.
It just seems that in this age of fast communications over the internet, nobody can be arsed to reply when you contact them via email !!
And now, because of covid, everyone is blaming that for any delay, no matter what you have ordered !!
 

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I have just been having a read through the service manual my S&S P-Series motor came with, which has a section on "low oil pressure at operating temperature".
These points may help,

It says that most engine mounted oil pressure gauges are not accurate once they are hot & to use an oil pressure switch as the best indication of good oil pressure.

To ensure you have the correct diameter oil lines on your bike, a minimum of 3/8" pipes/hoses should be used with a minimum i/d of 0.350".

To check the tappet screen to check it is not clogged.

After-market oil pump Pressure Relief Spring Cap, some caps have a very deep pocket on the inside causing low spring pressure.

Using too light an oil, minimum should be 20W50.

Check the feed side of the oil pump for damage. Debris that has passed through the oil pump can damage the feed pockets of the pump resulting in low oil pressure.

Check the operation of the pressure relief valve, if it is not closing completely you will get low pressure at idle.

Hope that helps, although the above is taken from the S&S manual these engines are all very similar in operation so I would guess the above points are good for any make of these Harley type motors.
 

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According to the Accel gauge on my engine, when it's started & cold, the pressure is around the 40-50psi mark & this drops to around 20psi mark once it's a normal operating temperature.
I fitted the gauge more as a "visual" indicator of oil pressure rather than relying on it being accurate.
 

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Hi all,
Ive have an issue with this engine getting noisy top end and at lifters once hot .
The oil pressure from cold is 20psi ( which seems low as it should be nearer 40psi ) but drops to zero unless revved hard once hot. It’s a new engine max 100 miles on it .
( 20 miles or after being warmed up for 15 mins then ridden 5 miles.
These engines have evo crank and external oil feeds to the STD heads. Lifter are like evo ones ( hydraulic)
oil filter is on a fitting which replaces the generator. ( checked filter isn’t the wrong type) and return to oil tank which seems good when running.
I’ve had the pump off and refitted , checked screen filter in case and even stretched the pressure spring after checking piston . Blew air ( manually ) up external feeds to head and heard it in rockers..

Any ideas or best of all a reason which I can fix.
Vulcan Engineering are impossible to get an answer from

Cheers all
CCS John - Scotland
I don't know how far you want to pursue this but I believe (not sure) that Retrocycle used to supply engines to Vulcan Engineering.
Maybe call (not e-mail) them? E-mails go unanswered from most small companies here.
 

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I was looking at the Vulcan site the other day after you brought this up and it looked like Motorway Engineering was the builder. I think they had a site of their own, but I might be lying. At least they appear to be separate.

This blurb was on the Vulcan page:

All Engines Blueprinted, Balanced, & Assembled by Motorway Engineering
 

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Discussion Starter · #12 ·
I was considering that but it’s the very obvious noise once hot.
The light, like gauge shows low pressure once hot .
oil pump is Vulcan’s own version, again this is what’s so frustrating about their lack of response to requests for help.
beautiful engine which looks so well engineered let down with shite customer service.
Mate in Scotland waited 2 years for engines he ordered and had paid for.
They finally turned up after he threatened to fly over personally to collect them and get compensation plus expenses.
Wheel Tire Land vehicle Fuel tank Automotive fuel system

Tire Automotive fuel system Motor vehicle Automotive tire Hood

Motor vehicle Automotive tire Gear Automotive lighting Automotive design

Tool Wood Bumper Auto part Automotive exterior

I was looking at the Vulcan site the other day after you brought this up and it looked like Motorway Engineering was the builder. I think they had a site of their own, but I might be lying. At least they appear to be separate.

This blurb was on the Vulcan page:

All Engines Blueprinted, Balanced, & Assembled by Motorway Engineering
Thanks Rootin,
I’ve tried contacting them via shop contact order form, emailing the various addresses and even calling them from the UK during their open hours ( phone wasn’t even connected 😳).

It would be great if there’s someone on here that could e
walk in their workshop and ask them direct , but is there any one near their shop on here who be willing?
I’ve emailed them the engine number for reference . The weird thing is the ten tooth oil pump gears rather than 14 or 9. I just wonder if the oil way to crank is too big, so it looses pressure to lifters and rockers as temp increases?
 

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Discussion Starter · #14 ·
Found this:
Hi Hillcat,
yeah i saw that, As you can guess, I’ve been trawling through all the sites looking for answers.
on this one it would be great to know where and what size the hole is supposed to be .
 

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Can't comment on aftermarket Pans, but being an owner of several Harley Pans, they were famous for not having much, if any oil pressure. Even after spending 6 grand on a complete rebuild, still no pressure. Found a guy in Daytona that had a jig to redrill right engine case to accept Shovel high volume oil pump. Bike would ride ALL day in 100 degree Florida heat, and hold a steady 40 psi.
 

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Discussion Starter · #17 ·
Can't comment on aftermarket Pans, but being an owner of several Harley Pans, they were famous for not having much, if any oil pressure. Even after spending 6 grand on a complete rebuild, still no pressure. Found a guy in Daytona that had a jig to redrill right engine case to accept Shovel high volume oil pump. Bike would ride ALL day in 100 degree Florida heat, and hold a steady 40 psi.
Hi Chas,
Thats interesting 😎
Anychance you know where and what he actually did?
I have great engineers over here but they need details on what .
 

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Call the S&S tech line,,, have as much information available as possible,,,

I know little to nothing about pan head engines, but believe if anyone can help, they can.. it is worth a call..

I know they used to offer a jig, that permitted the later model oil pump bodies to be used on the early right side case half..
 

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The gig is to convert to end oiler and 73 on pump. Basicaly gives lifters oil first then wlhen relief valve opens suplies crank. 73 upgraded pinion oil pump drive to 6 tooth and 24 on pump as pre 73 used 5/25 gears. But S&S motors are set up this way. The top end is lubed via push rods like EVO
 

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Off-topic slightly, but I see the Vulcan web site has been very recently updated.
It still has amongst it's offerings the 93" Panhead motor, which I have to say still looks very nice indeed & I'd still really like one for my latest build, but they say it has STD heads, (I though STD failed some time ago ?!) & they list their own oil pump as being fitted as standard.
 
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