NineMeister

I used the 4.0 litre torque figures because they were the best (to date)

3.6 non varioram engine
BMEP peak torque = 150.8 x (435Nm/1.3558)/220 = 220psi
BMEP peak power = 150.8 x (390Nm/1.3558)/220 = 197psi (approx)

Like I said, there is more to come. To quote from the link posted above:

"As a matter of fact, in order to get a BMEP value of 214 from our aircraft V8, we had to use extremely well developed, high-flowing, high velocity heads, a specially-developed tuned intake and fuel injection system, very well developed cam profiles and valve train components, and a host of very specialized components which we designed and manufactured."

Just about sums it up, methinks.

I'm not trying to be a smarta**e LAT but I do get exasperated at times - can I just repeat for the final time that 4 Tech are an F1 engine design company and by definition know just about everything there is to know about extracting power from 4 stroke engines, so if we did not achieve world beating bmep figures for our engines there would be something radically out of place. I know that this does not sit comfortably with you but what I am asking is that you attemp to accept that there are a handful of extremely clever engine designers out there and lucky for us (and our customers) one of them took pity on my budding 911 engine project.

LAT

Colin, not intending to make you get exasperated.

I have been around the tweaking game a long time and have seen more than my share of "new and improved" so I tend to bring a healthy dose of skepticism with me when I see claims.

I do like your explanation and thank you for taking the time to do so.

Svaha

When does 9m take pity on upstart americans?

NineMeister

Already have....




... hence why I am trying to offer you all a life less ordinary!

Nothing wrong with the Dollar in my book.

mr_bock

Verrrry Interestinggg.... I am thinking 9m heads AND the supercharger?????

SwayBar

Assuming you do get 350 crank hp, and run 5 psi which is an extra 1/3 of an atmosphere with accompanying fuel will yield approx 469 crank hp without taking into consideration thermal losses, and assuming tuning is spot-on.

Red rooster

Colin,
Just for interest have you ever applied the cams and exhaust modifications mentioned in the article to a 993 with standard Porsche heads ?Be interesting to see the plots .

Be interesting to know what extra bhp/torque gain the heads acheive in this equation .

Or have you ever measured the power gain on a motor that is completely standard other than your heads ?

All in the interest of science !!

Geoff

Carrera GT

I'd enjoy seeing the specs, I'm interested in alignment, so I like to see numbers that people find work well -- and a narrow body 993 with Sport Cups is a good reference point.
The GT3 front caliper is an impressive beast, but pretty heavy compared to other Brembo's and makes the Turbo brakes look puny. : )
I'm not sure what I'll do about brakes on the Turbo.

Lorenfb

"Or have you ever measured the power gain on a motor that is completely
standard other than your heads ?" - Red rooster -

Great question, but I think we both know whether you'll really get an answer,
(much less a true one)! This is a very common issue.

Actually, issues like this cause one to question where the real performance
gains come from. We frequently almost always never see the "before & after"
tests which provide significant clarifications, insights, & understandings to all.
Without this, how is one to make a proper cost/benefit analysis of a potential
mod, especially for very costly ones?

Bottom line: Consumers need all the appropriate info to make an intelligent
purchase decision! Is it unreasonable to ask for this?

NineMeister

Interestingly Johns car (non-Varioram) had the cams & cats fitted before he went for the heads and struggled to make 315bhp & 390Nm on the same make of dyno as ours (no plot on file I am afraid). I remember being disappointed with the result at the time since we expected to see around 325bhp, in the end we figured that his larger bore cargraphic headers were the reason for the torque loss although interestingly this was less of a problem with the 9m/4T heads fitted.

We have not had the opportunity to test the heads alone on a standard engine since customers are always looking for maximum spoot and we sell the full package of parts inclusing the cam at a discounted price (£5995 for heads, cams, valves, springs, retainers).

NineMeister

I do not take kindly to the insinuation that I am not being honest and would be grateful if a moderator would address this matter.

Red rooster

Colin,
Thanks for the information. I was just wondering as the cams may be too much for an OBDII motor ??
All the best with this venture. There is life left in the old dog yet !!

Geoff

pcar964

I wouldn't worry too much about the "doubters" Colin, I'd say the vast majority of us are quite convinced of your work

TheOtherEric

Ignore the haters Colin. We do.

LAT

I agree, skepticism is one thing but that sort of commentary in unnecessary and unwelcome.