1.25 Rockers

[sparky0028]

Let me start by saying that I put this engine together in the late 70's and there wasnt much info available and I was very young, so please no flaming. It's in a glass buggy used for a few years then sat from 87 till 09 (life got in the way).
It was a stock 1300 or 1500, I put on 87mm jugs, a C35 cam and tried some dual carbs back then. When I finally go around to it three years ago I only had the Holley bugspray and it was a pita to start, so i put on dual Weber ICT (sp stock heads) and it runs pretty good.

Back it the day I had the 1.25 rockers on and it seemed to make a considerable difference, but i do remeber busting a valve spring so I removed them and went back to stock.
Now that i have acess to the samba and all this info, if i decide to install the 1.25 rockers, what do i need to do to insure a trouble free conversion.

Thanks
Rich

[slalombuggy]

The biggest thing is to check your valve train geometry (do a search, LOTS of info) and to make sure you don't have valve springs that are binding. I would run HD single springs with the cam and ratio rockers.

brad
_________________
BB Buggy 121.253mph @ Bonneville 2012
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Raisin cookies that look like chocolate chip cookies are the main reason I have trust issues

[[email protected]]

switch to dual springs and then it will be able to handle the C35/1.25s.
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[mark tucker]

I used 1.25's on fk8 for about6 years with singles(scat hd) no problems at all. just make sue there is no coil bind & the geo is ok,and if using stock pushrods that there is no pushrod/tip&rocker cup interfearance., add some ball type swivel feet adjusters& I always use lash caps so the valves dont get beat up. you may need to shorten the pushrods.for mild motors I just shorten the stock pushrods in my lathe.have fun & dont get hurt.

[[email protected]]

he doesn't have a K8 Mark.
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[mark tucker]

yes I can read.and I have that cam on the shelf, it has about .017 less lift than the fk8 .so where is the issue?

[[email protected]]

you are comparing a cam designed for 1.5s, and using 1.25s, to one that is designed for 1.1s and using 1.25s, and you do not see a difference?
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[mark tucker]

no.I have both right hear and they both can use 1.25, I also ran the fk8 with 1.54 rockers. if I recall it also has a sp head on it, I realy see no reason for the duel springs.and I thought the fk8 was for 1.4-1.5, but it,s been years since I have looked at the app sheet.I see no issue .

[sparky0028]

Thanks John and Mark. One more questioned, if i found the $$$$ should I just upgrade my sp stock heads to dp and what would you recommend?

Rich

[UK Luke 72]

DP would be a big improvement wrth having.
John above will sort you a nice pair out

[mark tucker]

do you want it to go faster?then yes.I would go for the cb lost ponchos cnc ported heads if I needed a good set of heads that work on a small to mid size motor.add a set of 40 idf/hpmx crabs and you will be happy till you blow it up and want more power.but that depends on how much money you find.you can also just get a good set of stock heads and do some work to them ,it wont be as powerful but cheeper. just because you broke a spring with the 1.25 rockers dont mean it would of not broke with the 1.1 rockers.

[Sharig1979]

If you have the money I'd upgrade the heads. A set of dual port heads can be had pretty inexpensively, carbs are probably going to be more than heads by time it's all said and done. New pushrod tube seals are 5-10$ depending on how you go about it and then you can decide on the rockers. If you do go with the 1.25s I'd get shims and a new set of push rods and the springs really are your call. There are varying opinions on HD versus Duals and it really depends on what your intentions are.

I currently run dual springs with a C35 with 1.4:1 ratio rockers. That's only part of the story as the engine is turbo charged with h beams and blah blah blah. My point is that the needs change when you look at the engine as a whole rather than a component or selection of components. Then factor what you are going to do with it and things may change again.
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1991 GTI 1.8 8v, 4speed

[Sharig1979]

[sparky0028]

Thanks everyone, I was hoping to keep the ICT's. I realize there are better ones out there but I know I won't find that much $$$$.

Rich