2.3 litre - how to?
 

i went to watch some historic racing on the weekend. one guy was running a 911ST replica with a 2.3 litre motor.

anyone know what crank/rod/barrel etc combo results in a 2.3?

Hi Ryan

My tangerine 911 had a "2.3" - 66mm crank with 85 mm JE pistons in bored Nickasil jugs. Actually closer to 2.2 - 2245cc if I remember correctly.

P.S any idea if I changed my red car back to an ST look - would it be eligible for historic racing with its 72 2.4E motor or do they have to be all numbers matching to be eligible?

Robert

hey rob

where the 85mm pistons a custom order?

there are 2 main historic classes for 911's. the first is group S (Sa, Sb & Sc divided by age). group S requires cars to be all original (ie. no replica's) and is dominated by MFI 74/75 2.7 Carrera's. The odd Carrera3.0's do ok also but are a bit limited by having to run CIS - and thus can't run hot cams etc.

I think a 2.4E would do ok in sub group Sb - at least you could compete in the sub group...

your red car would have to fully match its chassis no. to get a group S logbook

the other option is group Nc - for historic touring cars that ran back in the day. replica's are allowed but the only 911's that ran in the day were 2.3 ST's. there was one group N 911 at the historics on the weekend - it went well but has to contend with mega hp camaro's etc.

your red car would need to be a 2.3 and early bumpers to run as an ST

check out http://www.hsrca.org.au/ for more info

Ryan

Thanks for the info. I got the 85mm pistons from EBS - I think pretty standard issue for them.

Robert

rob

and the barrels were stock 2.2 bored out by an extra mm?

Yup - but std. 84mm Biral (not Nickasil mistakenly typed in my first reply), bored to specs supplied by EBS.

Robert

Ryan,

was it a newly builty 911ST running or was it the one that has been around for a while.

Michael

mike, its a new one - silver - this was its 1st race meeting

there's some pics on the aussie pelican board