Dyno time tomorrow, anyone care to guess what the h.p. numbers will be?

[jmz]

Casey, I can't really answer that. I know that you can find some of the info in Bruce Anderson's book, particularly the addition of carbs and exhaust ...what did he write like 20 or 25 hp for that one?

Everything designed to work in concert so I can't really seperate out the hp increases.

The engine I had built is a pretty good "budget hot rod motor". I would have liked to increase the displacement to 3.2 litre but this would have added around $3,000.00 to the price of the job. I was lucky in that Andial had some loose (no cylinders) 95mm high dome pistons w/ valve pockets that fit my original cylinders perfectly.

anyway, it makes for a fun motor ...now on to the suspension for my next project.

[dtw]

I was going to call it 235 at the flywheel, so I would say you've done really well here. Enjoy that motor! Sounds like a lot of fun.

[Bill Verburg]

Everything designed to work in concert so I can't really seperate out the hp increases

Bingo!, So many people put a hp figure on each little thing. It doesn't work that way!! The pistons, headers, cams and induction are all working in concert.

I have posted numerous times about this. The late smog motors respond really well to cams & headers but are limited by the induction.

Ideal is cams, headers, pistons, valves, Motec and all the other little bolts and dodads, but then you have a $25-30k motor

[CamB]

Yeah - you did very well (I was close at 213hp!)

I had second thoughts afterwards - the "factory" version of that engine was the 3.0RS, which made 230hp. You seem to be about 10hp up on that despite webers not MFI.

I think the best way (bear in mind I am not an engineer or mechanic - just some guy) to look at these cars is HP/litre basis. Porsche managed around 80 hp/litre from S cams depending on the engine (smaller engines with closer to 85hp). Any figure beyond that had better have good reason (eg my engine has twin plug and 10.5:1 c/r, with EFI, for approx 85hp/litre).

[jmz]

Here I am 17 plus years later and many miles with redline being hit just about every time I drive it. This includes multiple track days, a7-8 times running very hard in the Hill Country Rally, Road to Rennsport Rally plus track day time at the reunion etc. ...in other words this thing is not babied.

The engine has not really been touched except for routine maintenance and a few years ago our friend Jamie Novak converted this thing from carbs to EFI for me. ...took a bit to get right and it runs quite nice but after looking at the dyno sheet and AFRs both Jamie and I think we can get a bit more torque out of it. (not max torque just accross the RPM band)

So looking back at this post the numbers were around 211 RWHP and about 200 for torque. So 17 years after this post and those dyno runs and this Mayo Performance built motor (built 1997) is putting out 223 RWHP and 205 max torque. For reference there was a few 964s that ran on the dyno the other day with me. Stock with Steve Wong Chip put 229 RWHP. Fresh 3.8 with 993 RS cams put down 261 RWHP. PORSCHE There is no substitute!

[gsxrken]

^^Thats a great story. You’ve had a great run with that car- congrats!

[icarp]

Good numbers Jay, my guess was 255 at the crank , you got 261
William said 220 at the wheels , you got 222
well done , looking forward to more ripping around the country with you
Ian

[dwelle]

ah yes, i remember your car jay. i was right in front of you at buttonwillow, quick little bugger.

that was a fun day.

and a big +1 for not babying these lumps...

[stupidwhitecat]

Originally Posted by jmz

Jamie Novak converted this thing from carbs to EFI for me. ...took a bit to get right and it runs quite nice but after looking at the dyno sheet and AFRs both Jamie and I think we can get a bit more torque out of it. (not max torque just accross the RPM band)

Interested to know what was behind your decision to go from carbs to EFI. I am looking to get rid of CIS in the near future and was considering both (leaning toward carbs).

[jmz]

Originally Posted by stupidwhitecat

Interested to know what was behind your decision to go from carbs to EFI. I am looking to get rid of CIS in the near future and was considering both (leaning toward carbs).

Horsepower and drivability both increased. Carbs are great and inexpensive plus the average mechanic can work with them but EFI is so much better.

[jmz]

Originally Posted by dwelle

ah yes, i remember your car jay. i was right in front of you at buttonwillow, quick little bugger.

that was a fun day.

and a big +1 for not babying these lumps...

Yes... great fun. Car is running so much better now. We had some issues that week with the EFI setup. All better now!