Engine codes

A1ex · Post by **A1ex** » Wed Jan 09, 2013 8:30 pm

Yeah a7 is much easier to find than a8. S2 cams wouldn't be much good on an a5 motor. better off with ATR cams as anthing past that would be too agressive for the 10:1 CR

LewisH · Post by **LewisH** » Wed Jan 09, 2013 8:33 pm

In that case, ill do the compression as well. Dont mind spending the pennies

Lewis -

Supermarine Blues · Post by **Supermarine Blues** » Wed Jan 09, 2013 8:37 pm

Donald wrote:From Carrisma's page on il interneto:

I don't think that the differences between the H22A5 & H22A8 engine have been fully documented for the public, but after research I have found the differences are with the:

Air intake ducting & filter housing are a different design using "dynamic chambers",
Camshafts with increased lift,
Different pistons increasing the compression ratio from 10.0 to 11.0,
Enlarged throttle body from 60 to 62 mm,
Exhaust manifold / down pipe is cylindrical as opposed to oval,
Exhaust piping has an increased bore of 57 mm instead of 50.8 mm,
Flexible pipe before the catalytic converter is shorter,
Catalytic converter is 5cm longer at 39.5cm,
Optimised ignition and injection timing,
Valve seats readjusted from 60 to 45 degrees,
Presence of a knock sensor on the H22A8
http://www.carrisma.co.uk/mycar.htm

Did it not come to pass that the exhaust/cat differences are related to the 220BHP JDM-spec too and our exhausts are all the same? Someone ended up with a Type-S one as the bits wouldn't fit, IIRC.

IIRC...

A1ex · Post by **A1ex** » Wed Jan 09, 2013 8:42 pm

LewisH wrote:In that case, ill do the compression as well. Dont mind spending the pennies

That'll cost you a grand in parts & labour. Better off buying a motor with the right pistons in

LewisH · Post by **LewisH** » Wed Jan 09, 2013 8:43 pm

Id rather buy brand new forged bottom end, with better bearings etc then buy an engine that has miles on it and has had no bottom end work. Like i said, i dont mind spending the pennies

Lewis -

A1ex · Post by **A1ex** » Wed Jan 09, 2013 8:47 pm

Forged bottom end for N/A seems an overshoot IMO.

If you're going for a full motor rebuild; re-bore of cylinders, blue printed bottom end, oversized pistons, bigger cams, new valve train etc etc I recon you'll be looking over 6k easy with parts

LewisH · Post by **LewisH** » Wed Jan 09, 2013 8:50 pm

I spent 5k on my old megane coupe i had... F7R engine (standard in that car) it had fully ported, polished, bigger valves, uprated springs, solid lifters and the highest lift cams possible for that engine and it produced (without forged bottom) 225BHP at the wheels. If i do any work, ill be getting another engine to work on over time in my shed. Might even turbo it, ive not yet decided

Lewis -

Post by **indigolemon** » Wed Jan 09, 2013 8:53 pm

In that case, an a8 or a7 is your best platform to start with then!

LewisH · Post by **LewisH** » Wed Jan 09, 2013 8:54 pm

If im gonna do either build, i think ill try my hardest to get an A8. im still waiting to check my gearbox code to see what sort of box i have.

Lewis -

Post by **Donald** » Wed Jan 09, 2013 8:55 pm

M2V5 I think it is.