shortie2 wrote:My experience lies with the F20 engine (s2000) which is a very similar beast, if you are getting a bespoke manifold made ask the guy to replicate hondas dimensions closely, (when i got mine it was 20hp down because of a 'super duper' manifold that actually reduced power !!), mappable Vtec really helps and really improves low down grunt ( i use RTD but there are loads of others), Big throttle bodies like 48mm jenveys and long inlet to butterfly length dont really affect peak power but really fill out the mid range well, we spent a bit of time at agra race engines over xmas on their dyno and learnt loads, those of you with any respect for engines dont look !!!
http://www.youtube.com/watch?v=Jrc0JSutbfg 255bhp and 185 ft/lbs from an internally std engine
Jim@2bular is making the manifold and he has done plenty to know the correct primary lengths and it is going over the top of the Subframe (Striaght Out). We looked at ITB's (jenveys) but you can't fit them in a 340R as you need long trumpets to get them to work properly and I would need a different type of ECU.
We have
RBC manifold with a custom made throttle body,
Fitting new uprated valvesprings
Head skim with high compression head gasket and a set of
Camshafts to suit the exhaust. All being made by Clockwise Motion.
Trying to get the most out of a standard bottom end and rev limit, i would expect around 250 BHP with a very flat torque curve (fingers crossed anyway
)
Alan
