5 replies to this topic

[da Silva]

I´ve got a few questions here.
Bore & Stroke on the most common F1 engines today, Ferrari, Ilmor, BMW
1.5 Turbo era same thing there, Honda V6 Porsche V6 BMW IL4 etc, also maximum torque (500-600NM? and max revs 12´-13´?. Max power by 10´? Compression too?

I read in an motorcycle magazine about an works Suzuki 750 superbike racer model year 2000 which had [if correct]
an realy oversquare bore. 96mm bore & 22.5 stroke! standard on GSXR750R is 72 & 46
Compression 15:1! standard 11.8:1
Does these figures seems to be true? Anyway claimed output was 165hp, seems low due to the radical specfications.
cheers

[Pioneer]

Unless you're the director of the CIA, you can pretty much forget learning anything useful about current F1 engines. Anything you hear from the teams PR doublespeak.

[ray b]

Originally posted by Pioneer
Unless you're the director of the CIA, you can pretty much forget learning anything useful about current F1 engines. Anything you hear from the teams PR doublespeak.

SADDLY totaly agree on new stuff
BUT TURBO ERA should be easyer today!!!
as by now mustbe old teck, all most history now

try E-mail to factory or builders can't hurt!

[Limey]

From McLaren Honda Turbo by Ian Ramsey

1983 Honda V6 RA-163-E

Bore 90.0 mm Stroke 39.35 mm

1984 or 1985 Bore reduced to 82 mm (not confirmed)

1986 Bore reduced to 79.0 mm and stroke increased to 50.8 mm

1987 RA-167-E
1010 bhp on 4.0 bar at 12,000 rpm
Max torque 677 Nm

1988 Honda V6 RA-168-E

Bore 79.0 mm Stroke 50.8 mm Capacity 1493.27cc
Vee angle 80 degrees
Compression Ratio 9.4
Weight 146 kg
685 bhp on 2.5 bar at 12,500 rpm
Rev limiter set at 14,000 rpm
Max torque 430 Nm at 10,000
Torque curve 400 Nm from 8,000 - 12,000 rpm

[BRIAN GLOVER]

Howdy, a BMW engineer unwittingly gave away some crutial information in an interview with a newspaper when he stated that the piston speed of the new engine is one metre/sec faster than the m3 road car which has a stroke of 91mm and revs to 8000rpm and a piston speed of 24m/s. 25m/s at 18000 rpm gives a stroke of 41.6mm. Assuming the cylinder displacement is 300cc, that gives a bore of 95.7mm. The massive B/S oversquare ratio is 2.297.
This piston speed is only 25% faster than a Rolls Royce Merlin of Spitfire fame. some of this information is shamelessley plagiarized from Racecar Engineering.
[QUOTE]Originally posted by da Silva
[B]I´ve got a few questions here.
Bore & Stroke on the most common F1 engines today, Ferrari, Ilmor, BMW
1.5 Turbo era same thing there, Honda V6 Porsche V6 BMW IL4 etc, also maximum torque (500-600NM? and max revs 12´-13´?. Max power by 10´? Compression too?

[da Silva]

Thanx a lot Limey and Brian!

Good figures there Limey. 677Nm from 1.5 liters! that´s impressive
I know a guy who built an Porsche IL4 cylinder turbo engine like the 968 turbo R(S)
using the cylinder head from an 944 turbo and having the bottom end from the regular
3,0 L 968. He had around 600Nm which is quite much and about 380-400 hp.

I thought of that too about the piston speed by the way.

This makes the RA 168 E have an maximum piston speed with 23,7 M/s in comparison with the BMW P80