aftermarket cam info

[williamb82]

ok, found the info i was after on a cam mfg's website. now we can get reground cams and know what we are getting. schnider does regrinds for $100 each if you send them cams to be reground, or 935motorsports sells them outright with no exchange for $400. the effective duration might be diff from hks's by 1 or 2deg but i dont think itll be an issue. these are advertised duration and effective duration at 0.050"

230deg 209 effective

244deg 218 effective

256deg 226 effective

264deg 236 effective

272deg 250 effective

284deg 256 effective

from a spec sheet ive seen on 7m regrinds
lobe center for intake should be 107deg and lobe center for exhaust should be 115deg

now, its up to you to chose the grind and the lift, then send some cams to be ground or get them from 935. the 244deg cams according to robert work well on a lightly modded 7mgte. id say a 8mm lift would work well with that grind on a upgraded ct26 and no port work on the head. if you have some port work and a smaller turbo(~400rwhp) the 256 would do well again at 8mm lift. i myself and going with 264's with 8.5mm lift as i have had the head seriously worked. i would go 272's, but i plan to drive the car on the street and want the power lower in the rpm range. the 230deg grind look a lil better then stock, so i really wouldnt mess with it. effective duration of stock cams is like 201deg. so prolly stock cams are in the 220deg range from what ive found. hope this info helps some people out.and mods might want to sticky this.
william

 

[SilverSoup]

great info, i'm assuming your talkin about the crower regrinds correct? and is the $400 for both cams w/o core exchange?

 

[GrimJack]

Does this mean we'll need fatter shims to compensate for material pulled off the cams?

 

[Stretch]

What is Schnider's contact info? A webpage or anything/ I tried searching on google but only came up with german pages and desert recipies :icon_razz .
eric

 

[figgie]

What is Schnider's contact info? A webpage or anything/ I tried searching on google but only came up with german pages and desert recipies :icon_razz .
eric

shhh

http://www.schneidercams.com/

you ate the E

 

[rakkasan]

Does this mean we'll need fatter shims to compensate for material pulled off the cams?

I might be mistaken, but I think the weld on extra material, then regrind them

 

[GrimJack]

I might be mistaken, but I think the weld on extra material, then regrind them

That would be very cool... esp as I have two extra sets at home right now...

 

[williamb82]

actually, they regrind them which reduces the base circle. now, you can have them welded up and then reground, but that costs more. how much more i have no idea. i havent checked yet.

 

[Mr.SelfDestruct]

shit, I'll just have my work do it, they do litteraly do everything...

 

[IJ.]

Will: The "lobe center" thing is a little incorrect.

Lobe center is a measurement between the intake and exhaust lobes.

You're not thinking of "Lobe Centerline" are you?

 

[williamb82]

Will: The "lobe center" thing is a little incorrect.

Lobe center is a measurement between the intake and exhaust lobes.

You're not thinking of "Lobe Centerline" are you?

thats prolly what it actually is, but the picture of the spec sheet showed it actually said lobe center. heres the pic. also, its a lil hard to tell if the intake says 107 or 167

 

[williamb82]

ok, got a reply back form schneider cams. heres what he had to say

264 adv. duration is only 220 to 224 @ ,050" 236 would be about 284 to 288 adv. welded cams $660.00 each with stock base circle. regrind only about .100 off base Jerry C


funny thing is i got those specs from another cam mfg. wonder why they say its only 220deg at 0.050" wonder if its cause of the lobe on the stock cam not having the material on it to go to that duration, or if the other cam grinder is more aggressive. ill check around with some other mfg's.

 

[IJ.]

That's about what I paid in AUD for my welded cams Will.
(seems a bit expensive in USD)

 

[williamb82]

ill just get the reground for $100 each. it only reduces the base circle by 0.1in. i can get some shims to fit under the buckets in that thickness im sure. anyhow. ill post more as i find it.

 

[IJ.]

How hard are you planning to rev it Will?

 

[williamb82]

8k rpm redline. might go a lil higher later if i get a larger turbo and need to. also, my n/a 6m with webbers will have a redline of 8k as well. the cams make power up to 7600rpm.

 

[IJ.]

You might want to look at either Shim Under Buckets or Shimless buckets as I believe 7M's tend to spit shims at high revs/hi lift.

 

[williamb82]

well, its not the revs, its the lift that spits them, but im not increasing lift that much. only a lil over 1mm. it wont be an issue. they dont recomend shim under buckets till ~11mm lift. anyhow. i will need to find some 2.5mm thick shims to fit under the stock buckets to compensate for the reduced base circle. do you have any idea where i can find shims that diameter and thickness? all 24 would need to be 2.5mm thick and fit inside the stock buckets. im sure other would need these as well.
william

 

[IJ.]

Check Mk3Tech Will, DrJ put up a post on alternative shims.

 

[williamb82]

i saw that. but im not looking to go shim under bucket. thats a heap more money on top of what im already spending. remember, im doign a full build, forged rods, pistons, block girdle, th400, garret gt40, ffim, 24x12x4 fmic, 830cc/min injectors, megasquirt, the whole 9. the more i have to spend, the longer its gonna take to finsih. also, the shim under bucket makes it harder to adjust the valve clearances, plus, i have a bog of prolly 60-80 extra shims for doing adjustments. so i pretty much always have the shim i ned.