2l 16v with throttle bodies

is that a valid representation of the head ? i.e does it really tilt back like that ? the included valve angle looks slightly shallower. xe head is about 46 degrees

 

no seems to be some strange stuff going on there, pretty sure the cams are level, the ex port id the 90 degree bend one

 

ive got proper graphs but they are from gerald dale motorsport and decidedly dogy due to massive coast down losses (i.e nearly 50bhp) rolleyes

 

any stuff on sbdevs site?

 

pinch of salt with SBD's figures really. they are all closed cell dyno graphs, about as useful as a 2cv in a last man standing destruction derby.

 

hee hee I did think 208bhp was rather good

 

take 10-15 off rule of thumb.

 

Interesting thread that on Vortex Prof


Edited by: G_V_K

 

aha, so the engine tilts back, and the head is angled. that explains why it looks cock on a flat surface.

so how do you fix the head to the block ? bolts that go round corners

 

I aim to please

 

"interesting" combustion chamber shape

then again i'm not an engine designer, maybe its fine

 

mildly cammed XE on bodies and DTA, initially looks like RobTs is better

 

regarding the peak torque, the xe does seem to suffer from losing the pre volume chamber. (thats the big box with SFi written on it, in standard trim) it was developed specifically for the engine and head.

definately an XE graph though, still got that trade mark dip at 4k ish.

these are my two dodgy gerald dale graphs from early in 2001 just after i fitted the bodies (120k ish miles)

 

nice is that stock cams?

 

yeah stock cams. it made 163bhp at the wheels on that run. every other RR after that day to the present has been circa 150 at the wheels, slowly declining as the engine became more decrepid.

as i said i dont really trust that run because of the massive transmission loss, plus the fact that the day has never been repeatable. (it made 189bhp and 169lb/ft earlier that day, with the fuel pressure too high)
Edited by: 0ddball

 

crumbs 2 bhp more than me ......







*dont mention the torque figure ahem

 

just found this old boy good reading