* Interesting 3.6 engine build coming up *
 

1991 3.6:

MAF

3.8 P&C

The pistons are very unusual; not the usual 3.8 pistons. These are almost 12:1 Mahles, special ordered.

Wildest cam grind I've ever seen installed in a 3.6. More info coming -

Chip burned for race gas only

Since I had 280 RWHP - my guess is that from the compression increase, cams, and displacement increase that it will approach if not slightly exceed 300 RWHP.

Stay tuned,

I've got my popcorn sitting right here next to the computer. This should be interesting...

Ralph

Consider this thread subscribed

Front and center....
Show time?

Pray tell

I would guess even higher than 300 rwhp. On displacement only you should get 295. Plys higher CR plus wilder cams. And since you say the chip is custom programmed for racing I guess the peak power will be somewhere around 325 rwhp.
Keep us posted

What kind of intake manifold are you going to use? Stock varioram? Individual throttle bodies?

Matteo -

I do think it will be higher than 300 RWHP on this dyno many of us in the Seattle area use. I'd gues 303. Stay tuned - I have some pics coming up. The pistons are a sight to see.

Stock plastic 964 manifold

Is that for the law of diminishing returns? 3.6 to 3.8 = 105%...
280 x 105% = 294.

Plus increase in CR, plus wilder cams, plus racing chip.. Yeah maybe 325 rwhp is silly, but I would have thought a little more than 300... Either way it's going to fly.

Bill Verburg had a special 3.6 upgrade built for him last year. Do not believe that it was as "warmed over" as yours sounds like it will be but it was far from stock either.

Hope he chimes in here, sounds like a interesting engine!

JoeA

you might want to check this out:
http://www.instant-g.com/Products/36Conversion/38.html

my engine was the last one described.

Hi Bill! How's it running?

and mine was #5

please take all these #s w/ a grain of salt, a factory sprint 3.8RSR was rated ~380

Count me in at >320 rwhp ;)

Here are the pistons:
http://forums.pelicanparts.com/uploa...1106605450.jpg
http://forums.pelicanparts.com/uploa...1106605492.jpg
http://forums.pelicanparts.com/uploa...1106605543.jpg

Craig,
It looks as though these pistons are coated. Is that Teflon? or can you tell us more about that.
Thanks.

The skirts do appear to have a coating - but I'll be damned if I know what it is.

Going in this tired 66k 3.6 engine:

http://forums.pelicanparts.com/uploa...1106606433.jpg

Those look like my pistons, if so they are 102mm, 12:1 Mahles, the coating is 3 - 4 <FONT FACE="SYMBOL">m</FONT>m Grafel coating

You didn't show the trickest part which is the tapered wrist pins

993RSR mahle on the left, 2.7RS(JE) on the right
http://forums.pelicanparts.com/uploa...1106607799.jpg

Yes, 12:1 pistons Bill. The wrist pins are indeed tapered - think megaphones on each end - big end outwards.

Bill, do you run 12:1 on pump gas?? Or is that the good old Mahle "12:1 but if you measure it they are more like 10.8" overstated ratio?

Jeff

How do you get the wrist pins in if they are tapered?

The ID is tapered - lighter

Craig,
I assume you're not talking about the motor you just put in your car?

No, this is a different animal -

yes, 93. electronics cover a multitude of sins.

yes, thats why i posted the 2 pistons side by side, look at the normal wristpin on the 2.7 and compare to the tapered RSR pin, grams are critical on these components. Same w/ the valves 993RS are much lighter( and bigger) than 3.2 or 964 or any of the earlier valves.

http://forums.pelicanparts.com/uploa...1106624934.jpg
Why is this so asymmetrical? I would think an even balance would be most important with these things.
Thanks for any info anyone can provide.
C.W.

Bill, do you also have the 3.8 heads/valves?

Have you run this on the dyno - FWIW, what were the #s?

THX

I am curious too Bill. I have a 3.6 comming in peices that I am going to put into my car. All options are still on the table including high compression 3.8 with cams. I searched but did not find much about your motor specs.

Thanks,

Jeff

yes, sodium cooled 51.5mm and 43 mm

Bill Howard and I did our engines at the same time, he out bid me for some mg, RS intake manifolds, see his prevoius post w/ the link to Steve Timmins site, mine is #5 and Bill's is #6 under the 3.8 section

Not sure what you are looking at, but the pins are axially symmetric.

I mean the piston is different on one side of the pin from the other. There must be a reason for this, I'm just curious as to what it is.
Thanks,
C.W.http://forums.pelicanparts.com/uploa...1106703607.jpg

Those pistons are a slipper skirt design, advantages are;
Lightens the piston, which, in turn, increases the speed range of the engine. Reduces the contact area with the cylinder wall, which reduces friction. Allows the piston to be brought down closer to the crankshaft without interference with its counterweights.

Also using slightly lager valves with smaller valve stems. Stay tuned.
Not my engine, btw.

All the 993 valves have ~7.9mm stems, compared to the ~8.9mm stems previously used.

base 993 was 49/42.5mm, going up tp 51.5/43.5mm. bigger are available aftermarket, a friend is using 54mm Ti in his GT.

talk about expensive :eek:

Seems like an awfully high money/performance ratio, I mean 300+ HP is not slow but certainly not high HP either. What am I missing here? :cool:

All degrees of tolerance for the ultimate engine, Denis......ultimately none of this 911 ownership really does make sense, does it? ;-)

Standing By...

http://forums.pelicanparts.com/uploa...1110308924.jpg
http://forums.pelicanparts.com/uploa...1110308981.jpg
http://forums.pelicanparts.com/uploa...1110309002.jpg

Does that say Motec? :p http://forums.pelicanparts.com/uploa...1110309051.jpg

Whatever happened to the guy who was going to use m/c throttle bodies to make a cheap induction setup?

Wasn't this guy -