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Tue Dec 20, 2011 1:59 am

I just got back a stock dished cam that was sent to be reground. It is supposed to be ground to match a W100 grind. I wanted to check cam lift. Put cam in case half with bearings rotated and measured from bottom to top of lobes with dial indicator.
I see manufactures lift at cam for a W100 is .383
My lift measurement at cam on regrind is .322
Have a few questions

1. Is this the right way to measure lift at cam?
2. Can they really regrind a stock cam to W100 lift specs?
3. Or do they get what lift they can and try to match durations?

If they can maybe I just received wrong cam?
I will contact machine shop.
I just wanted to also get some input from Samba members.

Thanks.

Tue Dec 20, 2011 2:27 am

yes, a stock cam can be ground to have .380 lift, I have several myself

I don't know if your measurement is accurate

Tue Dec 20, 2011 10:27 am

you need a lifter in there too.

Tue Dec 20, 2011 10:36 am

I went and mocked up case with cam and lifters. Measured with dial indicator lifter stroke from bottom to top while turning cam.
Also came up with .322 lifter stroke. Am I not using the right procedure for measuring cam lift?
This is suppose to be a regrind to match a W100 shouldn't lift at lifter be closer to .383 as a new W100 cam is?
Please let me know if I am doing this wrong or you can think of anything else. May just have got sent the wrong cam.

Thanks.

Tue Dec 20, 2011 12:12 pm

check with the cam grinder, they may of effedup,they may tell you to use ratio rockers,or it,s ok.For me if it degreed out what I wanted I would be happer than a 2 dollar hooker on dollar day.(and shes pertty happy) deburr the lobes good,stick some 1.4 raito rockers on it and let it fly,the more ratio the better.

Tue Dec 20, 2011 5:38 pm

so, uh, it would be fitting to say
You got shafted :P on that shaft

Tue Dec 20, 2011 7:32 pm

Ya
I kind of think so. Talked to machine shop where i got reground cam , told him about the .322 cam lift and he said he would call me back. He did and said that was about all the lift the grinder said he could get out a stock cam. But the duration are a close match to a Engle 100? Also told me if I want he will credit me full amount toward a Engle W100. Not sure how regrind will run.
Think I will go with Engle W100 that way then I know what I have. Grab some new Engle lifters and cam gear to. Plus change oil pump to flat cam style

Always something :roll:

By the way how would the regrind run with a cam lift of .322 and duration of 276 on this combo.
1600
DRD 35.5x32 performance heads, solid shafts with 911 adjusters.
Dual 34 ICT Webers
019 Bosch dist.
1 1/2" Tri-Mil header.

Thanks for info

Tue Dec 20, 2011 7:34 pm

Better than stock but see if you can get that header in 1 3/8 rather than the 1 1/2

Tue Dec 20, 2011 7:36 pm

Tri-mill is a company that makes headers

Do you mean the header it is a baha style off-road system?

If this will be a mild combo to match you tiny carbs :wink: , I'd look at one of the mild CB cams, like the 2233, 2232, 2280

Tue Dec 20, 2011 8:48 pm

Yes, off road style
Tri-Mil Bobcat with quiet pack muffler. On manx style street buggy.
Looked at CB cams Modok suggested. Found their 2231 is closer to my regrind lift .322 VS .313 for CB
duration on CB quite a bit less 268 vs 276 for regrind.
Maybe since I already have the reground cam I will give it a try?
Any idea how much of a improvement over stock it would be? I do not want to loose any bottom end.
I will be adding the DRD heads at the same time as cam change. Had stock DP heads before.

Guess I could also in time put on some ratio rockers as Mark Tucker suggested?

Again thanks for all the great info.

Tue Dec 20, 2011 9:08 pm

You desire torque all the way down to idle speed?
Then the 2280 is the best one :D

Sat Dec 24, 2011 12:13 pm

Hey
A couple last questions on this topic . Measured duration of reground cam,
230 [email protected].
So cam numbers are .322 lift at cam,duration 230 [email protected].
Thought about trying CB 1.25 stock style rockers?
My question is it worth the cost performance wise to switch to a cb cheater
(.359 cam lift 222 [email protected]) or Engle W100 (.383 cam lift,234 duration
@.050)
The cost estimate is around $200 -250(new cam,lifters,gear and flat cam style oil pump).

Thanks

Sat Dec 24, 2011 1:11 pm

230 degrees is pretty mild, that should idle PRETTY good

The main reason I like the cheater for you, is the desire for good torque at very low speeds combined with the little one barrel carbs. The very short duration of the cheater is best for that

The more duration the more it will try to idle on two cylinders, the "kadron idle"
8 degrees of duration is not a ton, but it will make a difference

Sat Dec 24, 2011 3:33 pm

I still say use the 1.4's on it.

Sat Dec 24, 2011 6:00 pm

If I went with 1.4 rockers that would lift at valve at .451 would you need dual springs as heads now have hd singles.
Was looking at CB 1.25 stock style rockers to put on my shafts would put valve lift at .401. Anyone used these CB part # 1692 ?

Thanks

Sun Dec 25, 2011 12:04 am

I ran an fk 8 for 6 years with single scat springs & never had any issues,and ran the crap out of it on a set of 042 mofoco's.but you do need to make sure the keepers are trimed so they dont butt.

Sun Dec 25, 2011 12:15 am

below 5k rpm the single springs are ok

vw style 1,25 rockers tend to be 1.20-1.25 ratio, so the lift should be reasonable, not too much

So your idea should work just fine, if you MUST use that mystery grind, which is up to you. Somebody has to use it up, might as well be you, eh Waste not want not

Sun Dec 25, 2011 5:06 pm

what is base circle on regrind compared to stock cam? why are you using a regrind cam?

Mon Dec 26, 2011 9:50 pm

who ground it?

I have been using regrinds for mild builds and reground lifters so that I haveno cam wipeout isues. 12 for 12 in th egood so far,, typ 1 and 4.