CB 1.4 ratio rockers wear

[1950split]

Hi,

I have my 2276, cb 2289 cam engine out of my car.
I have taken the rocker ramps of and checked the contact zone with my GB 369T lashcaps.

On cylinder 3-4, they are quite smooth. 1-2 cylinder side is different and I don’t know if I should just try to polish the wearing marks.

When setting valve play I did not have to adjust it due to excessive play.

I wonder if this wearing could have happened due to the engine reving to low when adjusting my carbs.

I have CB650 springs, tools steel lifters and dual tapered aluminium pushrods.

What do you think, should I change the rockers/caps?

Thanks,

Phil

[vwracerdave]

What RPM do you have the idle set at?
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[modok]

Not enough oil?
Perhaps you can groove/drill the rockers to get some oil out there.

[bugguy1967]

Rocker float? I know someone that had 650s and those aluminum pushrods, and they had horrible flexing. He had to switch to a thick chromoly pushrod. You can check for rubbing. Maybe start there.
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[Howard 111]

I would install lash caps. I've used them on my 1.4s and no wear. And recheck the geometry, the lash caps change that.
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[Dan Ruddock]

Because of clockwise crank rotation the 3-4 side gets more oil from the oil whipping effect. If CB dual tapered PR's are used I would put in something more robust. 650's are stout springs and will take their toll on your valve train. Some better choices below.

Dan

https://www.thesamba.com/vw/classifieds/detail.php?id=2083200

https://www.thesamba.com/vw/classifieds/detail.php?id=2159797

[vwracerdave]

[maui]

Dan Ruddock PRs is want I using and no flex. Try call him. Him nice guy.

[1950split]

Thanks for your replies.

Idle is set at 1200 rpm. However when adjusting my carbs I ran it at lower rews (500 rpm-800 rpm).

Could this wear come from a wrong geometry ? or does it look normal ? The rocker on the last picture is the "worst". You can clearly see that the lash cap has left a mark on it.

Do you think that my rockers are still usable ? Could I smooth out irregularities with grit paper going from coarse to very fine grade ?

GB do not have currently these taller lash caps (for titanium valve stems) that I have used to correct my geometry. I think they are from Del West. Any source other than GB ?

[vince1]

Hi Phil, here are 8mm valve stem lash caps available at Summit, maybe some have the thickness you're searching for

https://www.summitracing.com/int/search/part-type/...4294918244

Vince
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[1950split]

Hi Vince,

Good to see you are still into Aircooled VW's .

How's the van doing?

Thanks for the link. But none have the thickness I need which amounts to 0.131'.

What is your view on my rockers tips ?

[FreeBug]

There's a special set-up to resurface rockers like that and keep the right radius, the question is how were they hardened, and will you hurt it. I think the whole tip is hardened, but the surface might be harder, it's the first place to get quenched.

[slalombuggy]

As Dave pointed out, it looks like you have an oiling problem, not a geometry problem. Wiping rockers don't have any oil delivery through the adjuster. And, if it was a geometry problem it would also show up on the other side. You need t get more oil up to that head and possibly drill holes in the pushrods to spray oil onto the top end.

I'm running CB non-tapered pushrods with CB650 springs and only did so after talking with CB and them confirming that I would have no problems with flex with a Web 251 and those springs. Like you I also have tool steel lifters. Your tapered pushrods are even more resistant to flex than mine.

brad

[mark tucker]

did you do the oiling mods to the case to get full time oil to the heads? it does look like oil to me not rpm related. the guides in that head are probably dead by now also. I like the scat lash caps best. and dont use tight fitting lash caps...was it assembled dry? it's always a goood idea to use a little moly lube and a drop of oil on those. I drill my rockers for oiling there.and slot the bushing around the loaded half of the bushing from the oil hole to the new oil hole in a S or C pattern. that looks like it was dry and crap lash caps used along with not enough oil. many years ago cb had a shit batch of lashcaps that could do that(over 12 years ago/I dont know for how long till they were corrected)( lash caps are about the only cb product I dont like). I doubt it was a heet treet issue with the rockers.

[1950split]

The case does not have the oiling mod.

Lash caps are from Gene Berg.

Do you think my rockers are still usable?

Mark, what are the symptoms of shot valve guides?

[norris]

I had a set of CB 1.3s do the same thing. Couldn't figure it out. Installed Scat 1.25s ........smooth as silk after 1700 miles. No other changes were made.

[Dan Ruddock]

[Dan Ruddock]

Also those rockers do not look like my newer ones with the hardened black tips and they are shaped differently. How old are they?

[Clatter]

I thought they didn’t make windage tubes anymore??
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[1950split]

Dan,

The rockers used for this engine are CB 1.4’s and are about 9 years old. However the engine was used on for a few months before the car was stored.

It seems that in 2015 CB started production of new 1.4 rockers according to their website.