Carl Fausett

Yes. From now on, the Euro S 16v cams are not as hard to get anymore - we can make more of them.

The stock base circle is maintained on all our "S" series cams. The "R" series cams do also moidify the base circle to get the extra lift. However, we stayed within the limits oif the stock hydraulic followers so no mods to the valve train are needed.

Yes, definately.

belgiumbarry

Hi Carl... ofcourse i follow this here with eyes wide open...

now ... i know a fresh "rebuild" engine for sale out of a "wreck"... Euro , ofcourse, 16V.

What would i need to make a "monster" ? i'm thinking of the 6l stroker cranck, the race cams, springs ... rods, pistons ? .... make me a proposition... i like to prepare a swap engine... would take my carb installation and try it out....
Dry sump? oil pan tray ?

i'm dreaming...

SMTCapeCod

So, notion sparked by another thread....can you fit different distributor drive gear to run an HEI or an electronically controlled (i.e. programmable) ignition distributor?

slate blue

Cams are such an important part of the engine, the big three are heads, cams and comp, the 928 s in general have very mild cams because of their large capacity and important fact they were not to outdo the 911. The profiles look good, I would like to know how they are measured? Are they measured like Porsche at 1 mm lift or industry standard 0.50" or and I doubt this, is it just the advertised duration? I have two sets of 2V cams, one set which is going in my wife's car is 0.500" lift intake and 0.470" lift exhaust with 227 and 221 degrees at 0.50" respectively. I kept the same lobe separation as it is an auto. I hope to build this engine next year it is a 5.4 liter.

The other cam is a solid tappet cam that is going in the 6.0 liter has 0.550 lift intake and 0.505 lift on the exhaust. The conversion to solids is a bit time consuming but doable, this cam has 251 degrees on the intake and 242 on the exhaust with fast ramp rates. I plan on getting the cam DLC coated after it is superfinished. This is to cut friction and wear as it is an aggressive cam and I wish to run a 40 weight oil to cut frictional losses further. Also the revs capability is quite high in this engine around 8,000 and these losses really multiply when the revs rise.

When I converted to solids I used the steel inserted cam housings, two reasons, the ones that came on the S have long sleeves and I thought this may help valvetrain control at high speeds with reground cams as the base circle is reduced and as such the buckets go further into the housing. Also I may get the housings coated also.

Greg

Lizard928

Greg, how are you going to measure the valve lash on the 16V engine? modified cam housings?

slate blue

Hi Colin, yes they are modified cam housings, my head guys did the mod for around $250. Uses the same plugs as the housing does. Similar to what is in the link,http://www.lindseyracing.com/LR/Parts/SOLIDS.html it is an interesting article, I am using lightweight springs on the solid lifter cam, you can make your own solid lifters by machining the originals, not quite as light at 64 grams versus 57 grams but I am sure I could get the weight down further but this will add to costs. I was thinking of having some made from 0.9 mm nitrided steel, may be lighter still.

Greg

Lizard928

Greg, Consider looking at the caps on the 924/931 they have a tapered allen key screw which allows one to adjust the lifter would removing the cam housing which would be a HUGE time saver.

slate blue

Thanks for the tip Colin, always looking for a better way of doing things.

Greg

RicerSchnitzzle

Would be nice to see the difference the 2vR makes on the dyno for an otherwise stock Euro S. Then again with headers and X.

mark kibort

Im so BUMMED that i didnt grind off that bace circle by .5mm when i had the chance! (2 twice!!!).
I didnt know for sure it would work, until Dennis finished his a few weeks after my cams were re-installed on the new stroker bottom. I guess I could pull the cams again and take a file to them

mk

andy-gts

Mark,

what does grinding off the base circle mean and what does it accomplish?
andy

hacker-pschorr

If my budget permits, I would like to install Carl's stage 3 (not sure what else to call them) cams into my stock 79 track car and do a before / after this winter. I would like to "break in" the new cams with an old motor before building my new short block.

It's the off season, you have time.

Um.......a file? Would anyone else like to handle this one?

BC

No

RicerSchnitzzle

Grinding down the base circle effectively make a "Larger" cam as long as the hydraulic lifters can pump up the extra .5mm to stay in contact with the cam. It's an easy way to add lift with out adding metal. However with a smaller base circle ramp rates increase slightly. ie you've not only changed the bottom and top numbers but how quick it gets between the two. It will open at a faster rate intitially and slower closer to the peak. It's the opposite on the way back down to close. Not much difference but a reduced base circle cam will have a slightly different torque curve compared to a standard base circle cam with the same lift and duration.

Lizard928

I saw this and nearly dropped a brick!

I pray that he is having a gag at us!