For the 'natural aspirators' - How tuned is your engine?

[DE1 75]

Escy said:

Porsche 968 - Bore 104, 4 cylinders, power 236bhp = PI 563
Porsche Boxster 2.5 - Bore 85.5, 6 cylinders, power 201bhp = PI 473


I've never owned a Porsche, I tend to buy cars based on engines and Porsche make nothing decent anywhere near my budget. I don't know how Porsche get away with selling such rubbish as sports cars. No wonder they are perceived as reliable with the power they produce. Maybe they used the blueprints from the 2.2 Land Rover engine posted earlier?!

Those are quite old models quoted there. Pretty sure the latest dfi engines would score higher and are more reliable.

[Escy]

DE1 75 said:

Those are quite old models quoted there. Pretty sure the latest dfi engines would score higher and are more reliable.

Maybe old but those engines were way behind other manufacturers in terms of specific output when they were new. It just puts me off.

[stevesingo]

My BMW S14 with 280hp and 95mm bore is PI=800.

[Liquid Tuna]

Legacy 2.5 petrol - 4 cylinder boxer - bore 99.5, a whopping 165bhp - an amazing score of 430

[Chicane-UK]

My Corrado VR6 has been lightly tweaked and puts out just over 200BHP on a rolling road, or at least did a couple of years ago..

82mm bore
6 cylinders
200bhp

PI score of 511 - weak!

[Type R Tom]

697 for my FN2

[M11 MFP]

SBD c16xe? In its most extreme form 241bhp ex 81.5mm bore 4cyl.

= 936

I reckon the highest for an engine that the private indivdual could realistically run, although the maximum before det on pump fuel would probably be circa 216 hp, therefore 839 .

Some BTCC engines, SB 2.2 cup engines, F1 motors, etc above this.

[JordanTurbo]

M11 MFP said:

SBD c16xe? In its most extreme form 241bhp ex 81.5mm bore 4cyl.

= 936

The SBD C20XE in its highest tune makes 290ish bhp from an 88mm bore size giving a score of 966

[Kawasicki]

BMW E30 318is
4 cyl of bore 84mm producing 136bhp.....so a score of 497

KTM 525 EXC
1 cyl of bore 95mm producing 50bhp....572

[Kozy]

JordanTurbo said:

The SBD C20XE in its highest tune makes 290ish bhp from an 88mm bore size giving a score of 966

Now that's impressive!

[Kozy]

Double post

[davepoth]

I think I've found one that breaks it. The BMW S14 lump which was de-stroked for Italy and Portugal in the E30 320is. 1990cc and 189hp, which makes it nearly 95bhp/litre, but it only scores 559.

The standard S14 on which it's based displaces 2303cc and makes 197hp, giving just under 86hp/litre and a score of 582, but the smaller engine is obviously harder tuned by any normal definition.

Any thoughts?

[M11 MFP]

JordanTurbo said:

The SBD C20XE in its highest tune makes 290ish bhp from an 88mm bore size giving a score of 966

Ok, I raise you 1997 IES/Judd nissan primera BTCC . 88mm bore, 310 or 320hp, depending on who you believe.

score 1032 - 1066

http://www.marklamond.co.uk/misc/scans/CCC_1999_Fe...

About as far from a road car as it gets, however.

[JordanTurbo]

Kozy said:

.....to calculate the maximum power an engine could potentially make. It is rated out of 1000.....

M11 MFP said:

Ok, I raise you 1997 IES/Judd nissan primera BTCC . 88mm bore, 310 or 320hp, depending on who you believe.

score 1032 - 1066

[zeduffman]

Golf R32 scores 609... not too shabby.

[Japveesix]

FTO GPX scores a PI of 551 with 78.4mm bore, 6 cylinders and 197bhp.

Could be worse and whoops my mx-5

[richard300]

I cant get the calculator on the web link to work

84(bore) 6(cylinders) 230(bhp)

Anyone got the answer?

[Captainawesome]

836 from my e46 m3. No bad.

ETA 6 cylinders, 84mm bore and 343 bhp

Edited by Captainawesome on Sunday 13th October 11:30

[moreflaps]

You need to include max rpm in your calculations.

HTH

Cheers

[JordanTurbo]

moreflaps said:

You need to include max rpm in your calculations.

HTH

Cheers

If you read the website he already has by using max safe piston speed and stroke.

The Rev limit used by a manufacturer has no real relevance when your talking about the maximum power an engine of any given size "could" make.