Existing cam wanting to add 1.3 ratio rockers

[RCP Phx]

I have a 1955cc motor that I built a few years back. I want to add some 1.3 roller rockers to my existing cam. The cam is a bugpack 4062 (.284*/.415") on 044 heads. My question is whether that will work and if it would be a good idea.

[QRP]

That cam with standard 1.1:1 rockers is already giving you almost. 460 lift
With 1.3:1 you'll be at .540

I wouldn't do it, but thats just me.

[clonebug]

Let me give you my experience on changing rockers......in the quest to get "More" power......

W-100 cam with .383" at the cam. I figured maybe some `1.25 rockers for around .500" lift would improve the hp. They are recommended to run 1.1 or 1.25 only.

Asked a few questions and those that replied said it would be doable..


Bought a set of 1.25 rockers....

Set them up and found they were measuring out at 1.37-1.38....
Call the Ebay supplier and he sent another set no charge....said he'd measure to make sure they were 1.25...they were exactly the same.

Decided to go for it anyways even though it wasn't correct for the cam.....

Had them narrowed to fit better and allow shims to adjust side play to minimal for optimum lift and lowest noise. I also had the lash caps machined for a tight fit to the valves since they wouldn't work as bought.
Bought a set of Cromoly .035" pushrods so I could cut them to length.

By now I had almost $300 .00 into them.....I now had narrowed rockers, pushrods and shims galore.
I spent a lot of time on geometry and then had my neighbor cut them to length on his mill. It worked great and I installed the ends. Added CB 650 outer springs for the extra lift. Milled off about .070" from the rocker blocks on the head for better geometry.

When all was said and done I had 1.38:1 ratio rockers on my W-100 cam putting out .526" lift.
All in all it was about a $500.00 upgrade not including the time it took to set the geometry.

That is the short version..........

HP gains???? Couldn't really tell on the butt dyno.

I did manage to blow my spider gears out on the trans.

Was it worth it??? Still testing.

I put 3660 miles on that particular valve train and when pulled apart the cam and lifters were in perfect condition..They have a combined 46,000 miles on them. I could have kept that setup but I swapped to a FK-42 which is compatible with 1.4 rockers.
That now has 4100 plus miles on it with no issues and quiet running. It has almost exactly the same lift and a little more duration but it really hasn't given a noticeable hp gain either.
Although with the California trip last summer and the trans issue 1100 miles from home I haven't really given it the testing it deserves.

It is a great driver though.......

A lot of the "Upgrades" I have done have had a very low hp/$$$ return on my investment.
The cheapest hp was the turbo addition....but over time that isn't really cheap because you keep wanting more and will sell your left testicle to get more boost.

Now if I could just be happy with the 226 hp I have........
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[RCP Phx]

I believe the cam is rated .415" w/ 1.1:1 rockers that means the change put me at .490" of lift. I'm not looking for more lift but I did purchase the Pauter roller rockers, I just am trying to find out if I can get away with it without splitting the case and changing cams? I'm already thinking about some beehive springs to replace the CB springs that are in there now.

[NJ John]

Maybe your larger displacement combo is wanting more lift and will benefit from it. Your valvetrain is probably up to the task. I would try.
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1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage

[Alstrup]

[RCP Phx]

The motor was built about 8yrs ago and I don't recall the CR I set it up with(probably around 8.5-9). For what it's worth I am also running a single 48IDF.

[Dan Ruddock]

[Lingwendil]

[RCP Phx]

This motor probably only has maybe 500 miles on it and I just did a serpentine conversion on it. The motor is also a long rod CB H-beam @5.500" (82 stroke pistons) and I love roller rockers!

[RCP Phx]

Here's what I'm working on ......

[Alstrup]

In that case, forget what I wrote.
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https://www.thesamba.com/vw/forum/viewtopic.php?t=435993

[FreeBug]

There is going to be a lot of discussion about how "correct" that combo is. Strap in.

[oprn]

Look for a set of see through valve covers, those rockers are very pretty! Nice addition to a pretty engine but a shame if they are hidden.
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We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age)

[RCP Phx]

I haven't been on here in years but I am hoping for lots of input on this. If I have to split the case I will probably just build a new motor with a new super case. This one was shuffled/welded by Rimco.

[NJ John]

Again, it seems like a well built engine, but with a small cam. Put, the rockers on!
_________________
1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage

[RCP Phx]

I finally found the build file on this one. I've got all the specs except I show the cam ordered was a CB 2239 (.276*/.417"@1.1:1) but I don't show it being delivered but since that's very close to the 4062 I'm not surprised that I would order one. I also show 5.400" rods so I'll have to re-compute those numbers.

[Paul.H]

The cams OK and you may be OK with the rockers but the intake you have is the worst thing ever made for a VW and even worse with a 48 carb

[Danwvw]

Probably could run the Webcam 118 with the single HD springs and some good aluminum racing pushrods with the 1.3:1 rockers, Probably the CB-Performance UltraLight lifters would play nicely here: A dune buggy or baja benefits from a single carb so figure out how to jet that 48 for it Probably (32mm, 34mm venturi's) for it and it'ted probably be good.
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[Brian_e]

Any idea what the heads are and what they flow? If they are done flowing at .450”, than the extra lift won’t help all that much, other than holding the valve open a bit longer. If the heads keep flowing up past .500”, then the extra lift will help add more area under the flow curve, and help pack more air into the cylinders.

Are dual carbs an option with that buggy body? I would be doing those long before ratio rockers.

Brian
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www.type-emotorsports.com