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Wandering Child
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Discussion Starter · #1 ·
I have it on good authority that the standard dealer 95" BB kit and Andrews 26 cam would work fine with stock heads on an 06' touring bike. With that said, I've seen a couple threads here recently pertaining to the optimum compression ratio's and potential pinging issues when using an Andrews 26 or even 21 for that matter and it has me concerned.

06' SE catalog lists the compression ratio for their 95" kit using SE cast flat top pistons and stock heads as 9.4:1. I don't know how accurate this is, but to me the question comes back to potential pinging issues. So, here I go again. 95" BB, SE flat tops, stock heads and Andrews 26 cam. Ping ping ping?
 

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Right from Andrews Tech:

George, Yes either the 26 or the 37Cams would be a good choice.
With the 26's your compression ratio would need to be slighhtly
lower. 9.0 would be perfect. These cams build cylinder pressure very fast and higher compression may cause detonation. The 26's have an awesome low speed power band 1800-5200rpm. The 37's are very close 2200-5600rpm they come on a little later and so doe's thier torque. I would consider the 37's
more of a Hotrod cam. Where as the 26's may be considered more of a touring cam. Touring for Bikes that are heavy,traillering, two up riding or climing hills. Both of these cams have a power band that gives them good Hiway performance.
Ralph
According to Andrews, anybody with a bumped compression ratio is in for some pinging. It also seems a Cometic .030 is a major NO-NO with this cam.
 

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Wandering Child
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Discussion Starter · #3 ·
George C said:
Right from Andrews Tech:



According to Andrews, anybody with a bumped compression ratio is in for some pinging. It also seems a Cometic .030 is a major NO-NO with this cam.
Thanks. What was your original question to them?

One of the gurus here and one who isn't here any more recommended using the 26 with stock heads. I really don't want pinging issues. Can anybody else chime in on this? I'm going to give Andrews a call in the mean time. Thanks.
 

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My question was which cam was right for my build. SE 95" flat tops.
FXSTBI, I weigh 270, I wanted power down low, but did not want to compromise my power at interstate speed.
I asked about which cam they recommended.

After all that, I decided on sticking with the SE 204..

If I went with Andrews, I didn't want the dealer to blame a third party on any shortcomings. If there are any tuning issues, it's all Screamin Eagle...

It sounds like the 26 would work better with a stock 88 bore and it's lower compression ratio.
I'm sure there are some folks out there with first hand experience with the 95" and the 26 who will pipe in and answer some questions.
 

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George C said:
My question was which cam was right for my build. SE 95" flat tops.
FXSTBI, I weigh 270, I wanted power down low, but did not want to compromise my power at interstate speed.
I asked about which cam they recommended.
George,

What did they recommend for you?
 

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Wandering Child
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632 Posts
Discussion Starter · #6 ·
George C said:
My question was which cam was right for my build. SE 95" flat tops.
FXSTBI, I weigh 270, I wanted power down low, but did not want to compromise my power at interstate speed.
I asked about which cam they recommended.

After all that, I decided on sticking with the SE 204..

If I went with Andrews, I didn't want the dealer to blame a third party on any shortcomings. If there are any tuning issues, it's all Screamin Eagle...

It sounds like the 26 would work better with a stock 88 bore and it's lower compression ratio.
I'm sure there are some folks out there with first hand experience with the 95" and the 26 who will pipe in and answer some questions.
Thanks George. I called Andrews and they confirmed what you were told. The tech there said that they recommend 9.0:1 compression for the 26 cam. He said much above that there may be pinging issues. I told him that the BB kit and flat tops comes out to 9.4:1 according to the SE catalog and he suggested going to a thicker head gasket to get the compression down some if I still want to use that cam. Can anyone confirm that the SE BB, flat top and stock heads is indeed 9.4:1?

Now I have some conflicting issues between what was recommended here and what Andrews says... Looking for some help here folks. I'd like to use that 26 cam but some doubt has crept back in. Is a thicker gasket going to solve this for me? I want to do this once and not screw it up. Thanks.
 

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IMO, if you go and measure the parts, the actual CR at 0 deck height, stock heads and .030" gaskets on a 95" ends up at 9.3 (with the stock gasket at about 8.9) if the chamber is spec 85 cc.
It actually may be easier to tune the bike with the thinner gasket due to the better squish height.
The 06's also have much better flowing exhaust ports.

It should not be a problem with a decent (not even great) tuner, without even considering that most engines do not have 0 deck height, ie they almost always are at least 5 tenths down.
 

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Only issue with the 06's is that quite often when modified this way they seem to work a lot better with the upgraded injectors.
 

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Do the build, get a Powercommander or SERT and I am sure a good tuner will get it to run great with no pinging. I have seen a number of the dealer installed stage 2 bikes ping like crazy on hot days. You can usually fix most of it with a DFO dumping a buttload of fuel at the problem, but to optimize performance and gas milage the PC or SERT is better suited.
 

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Wandering Child
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632 Posts
Discussion Starter · #10 ·
HIPPO said:
IMO, if you go and measure the parts, the actual CR at 0 deck height, stock heads and .030" gaskets on a 95" ends up at 9.3 (with the stock gasket at about 8.9) if the chamber is spec 85 cc.
It actually may be easier to tune the bike with the thinner gasket due to the better squish height.
The 06's also have much better flowing exhaust ports.

It should not be a problem with a decent (not even great) tuner, without even considering that most engines do not have 0 deck height, ie they almost always are at least 5 tenths down.
Just so I'm straight here. Either gasket will work fine in this application but you recommend the .030"?

Can you tell me a little about the upgraded injectors? Is this a Harley part or from a different source?

Thanks for the help.
 
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