travel limit spacers in lifters

[injected05]

How many are using the travel limit spacers in their twin cam build? Looks like a smart thing to do.

[HDMD88]

Originally Posted by injected05

How many are using the travel limit spacers in their twin cam build? Looks like a smart thing to do.

Why does it seem to be smart thing to do ? How do you think they do or claim to do and how is it done and lastly what purpose does it serve in your build?


































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[claydbal]

we need lifters that limit travel the opposite direction. lol

[dog155]

Both my Evo and TwinCam have the travel limiters,the reason for them is they limit the bleed down of the lifter to about .020,to make starting big inch motors a little easier on the starters.

[compressor#v]

Originally Posted by dog155

Both my Evo and TwinCam have the travel limiters,the reason for them is they limit the bleed down of the lifter to about .020,to make starting big inch motors a little easier on the starters.

Thanks Dog155. Do the limiters have an effect on noise? Will the lifters be louder?

[springer-]

What they do ....

When you shut off the engine there is typically at least one valve that is hung open. When the valve is open the spring keeps pressure on the valve train. This pressure causes the lifter for that valve to bleed down, just like when adjusting pushrods. This changes the timing for that particular valve when the engine is first started, until the lifter pumps up. Depending on the build specifics, like compression, cam timing etc. this can effect starting and other things. The more the lifter is allowed to bleed down, the more it effects the timing of the valve. In more aggressive builds with more aggressive cams and compression, limiters can be installed in the lifter to limit the amount of bleed down to prevent this from happening. With a standard .100" adjustment, the lifter can bleed down .100" before bottoming out. That means higher cylinder pressures when starting before the lifter pumps up.

The theory behind the limiters...

Adjust the pushrods until they bottom out (with limiters installed). Then back off a couple wrench flats. This only allows the lifter to bleed down a few thousandths when not running. When the engine is running the lifter still acts like a hydraulic and as the engine expands, it compensates with the cushion of oil. Another thing the limiter does is to stop the lifter from collapsing at higher RPM's. It acts like a solid lifter. This becomes more evident when using heavier valve springs for higher RPM's.

Are they louder....

I have never run them myself so I can't tell you from experience. But in theory they should be louder whenever the lifter plunger is on the limiter. At higher RPM they should be louder as well since it would stand to reason the plunger would hit the limiter on every valve open event and lift off it during the close.

IMO, there would be no reason to run them in a mild street build.

[01fxdx]

i would say the noise level is of no concern. want quiet? build a goldwing........
just kidding, have been running them for about 6 years now. wouldn't build withoutem.

[dog155]

The Evo is a little louder than the TwinCam,a sound I have always loved to hear.It is a sound that once you realize nothing is wrong will blend into the background.Some find it very annoying.

[HDMD88]

Originally Posted by dog155

Both my Evo and TwinCam have the travel limiters,the reason for them is they limit the bleed down of the lifter to about .020,to make starting big inch motors a little easier on the starters.

They limiters have nothing to do with your starter, sorry, it only takes a few revolutions to pump up that collapsed lifter so I see no benifit for starting.
Springer explains them the best....you do not need limiters or Jims Hydro Solids (which do the same exact thing) in a motor with less than 220 seat pressures on the valve springs and very aggresssive cam ramps. If you have that kind of pressures your in the 450lb range when open....there you will have some trouble keeping the lifters pumped up at higher rpm running so the limiter will act as a solid lifter at that point.
Are they noisy....try a set with woods cams....it will drive you never to ride the bike again. The are a waist of money for a street build in my opinion, they where designed for high end builds, with stressed valve trains.
I only asked the questions about the limiters to see if you really knew what they did and why you bought them besides some one told you too you needed them.....Jims Hydro Solids are in the neighborhood of $450.00 a set and for what.....you gained nothing from them but noise with a street motor.

[KingofCubes]

Have to agree with Doc, I just adjust the pushrods down .140"- .160" into the lifter and call that good.

[Mother]

Have to agree with Doc, I just adjust the pushrods down .140"- .160" into the lifter and call that good

I am installing Leineweber T-7 gear drive cams. 254/258@.053-.603"lift along with a new set of HD 'B' lifters and valve springs with 175lb set pressure(will have to check open lbs). Should I install limiters? My rev limiter will be set @6400rpm. Adjusting .140-.160" into the lifter is done by 'X' amount of flats? No harm to the lifter or valvetrain?

[Handfiler]

I set mine by bottoming the lifter plunger and then shorten the push rods by 060". That was the recommendation from Woods and it works for me.
If you want to add a device to ease starting I would suggest compression relief valves.

[mccycle]

Mother have you talked to jim about valve spring pressures with this cam and roller rockers,I run this cam in my 106 t.c.,had spring problems at only 190 seat and 420 open. If you plan to rev as high as 6200, you will need a fair amount of pressure as some roller rockers have more outboard mass on the sping side.This cam definetly benefits from the limiting rings.

[Kwikt]

I've got the S&S lifters with the travel limiters in my 95ci. Been running them for the last 3 years with no problem but they are a littlle noisier. One thing to remember.... you don't have to worry about a collapsed lifter with these.

Kevin

[Mo-Dog]

I am running them in Harley B lifters to help with hot starting issues on my 117 and they helped significantly...no more hot start issues... yes, they are slightly noisier when starting the engine when cold...BTW, thanks to Tim for the idea...and a lot of other good ideas...

Originally Posted by HDMD88

Why does it seem to be smart thing to do ? How do you think they do or claim to do and how is it done and lastly what purpose does it serve in your build?/