A&Q about 350Z
Q:
My N/A 2ltr 20v ran 11.5:1, i ran it on 97 ron pump fuel.
A:
Its all in the mapping.
A:
Nice engine bay!
A:
Lupo GTI motor runs 11.5:1 CR stock.
A:
Could eat your lunch off that.
A:
My N/A 2ltr 20v ran 11.5:1, i ran it on 97 ron pump fuel.
Its all in the mapping.
Sorry just been told it was 12.5:1
A:
I'm pretty sure they know what the compression ratio is, 11:1 rings a bell but not 100%, i'll check tomorrow. Is it simply (lol) a case of lowering the compression ratio then? and if so by how much and what is the best way to do this?
Is the 92.8 and 95.5 the totall throw of the crank?
As others, should run fine on pump fuel an 11:1. You should also be able to run the correct amount of advance needed for best power that the engine wants.
92.8 or 95.5 is indeed the stroke of the crank. On an 82.5mm bore you'll get 1984cc with the 92.8 crank (standard 2ltr) and 2042cc with a 95.5 crank.
A:
Right then, had a bit of an update on this from the south africa. The fuel the engine is designed to run on is 102 octane with, i think, a 13:1 compression ratio. So would this be alright running on say tesco 99ron or would it be best to go for the BP 105ron stuff that you can get now?
A:
105ron ain't seen that about?
A:
Bp's fuel is 102RON, not 105. By the way its 2.50 a litre. Thats pounds, not pence.
A:
Too high for pump fuel. Speak to these people... Anglo American Oil Company... 01929 551557 and ask to speak to Anders, "very" helpful and easy to deal with, he'll know exactly what you need.
It's not cheap, but cheaper than a blown engine and can be delivered straight to yr front door.
Or take a look here...
A:
£90 for 25L.....hmm
be ok for dragging / hillclimbs or if you had a pukka small race fuel cell etc, not supposed to have it in tank for more than 48hrs
109ron with 4.5% oxygen, unleaded, pmsl
119 ron leaded............
A:
We changed to some Sunoco stuff on one of the M3's. Made an extra 17bhp over Optimax one mapped up. Deffo worth a look.
A:
is the fuel race cars run on not going to be more closely controlled in the coming years msa events?
this article will probably give an idea of things to come.
A:
A:
Thanks for that, thought the BP stuff was 105 for some reason... We're going to run it on the BP 102 stuff for a while just to get it running, but if we decide the car is competitive enough for us to put it in the series then we'll have to change it to 99ron. So, would i have to lower the compression ratio by a significant amount to do this? and if so what calcs etc. would i need to do work out the change in volume of the bores required?
Thanks guys!
A:
I'm sure the S2000 engines run an inlet restrictor / small dia. throttle body to conform with FIA Regs. That would explain the 13:1cr. Kinda similar to F3 motors, inlet restricor and very high cr's also. Thing is, the rest of the motor, cam profile etc. will be engineered to work with the restrictor. The BP102 might be completely different to the 102 it ran on in SA. I would stick some Optimax in it, make sure it starts, then get it mapped and see how it comes out.
A:
i imagine 9a crank and rods in that, with some modded 9a pistons, well that was the way i was going to do it anyway
if it has an inlet restrictor then that will limit the cylinder filling and hence potential detonation, just make sure its remapped for optimax and the cooling is spot on
A:
Thanks for that, thought the BP stuff was 105 for some reason... We're going to run it on the BP 102 stuff for a while just to get it running, but if we decide the car is competitive enough for us to put it in the series then we'll have to change it to 99ron. So, would i have to lower the compression ratio by a significant amount to do this? and if so what calcs etc. would i need to do work out the change in volume of the bores required?
Thanks guys!
AAOC also supply a "pump" fuel that is MSA compatible, lower spec than some of the fuels but better and more consistent than forecourt stuff.