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cam duration
Posted: Mon May 26, 2008 5:48 pm
by Ralphh85
does anyone know the cam duration of range rover/SD1 vittesse/TVR, or any other rover engines in any state of tune?
or the degrees of opening/closing on the cams.
in aid of pulse tuning for an exhaust build.
Ralph
Posted: Mon May 26, 2008 8:02 pm
by ChrisJC
The Range Rover Haynes manual has the open / close angles of the standard cams for carb & EFi engines. I think it's 285degrees.
Chris.
Posted: Mon May 26, 2008 9:09 pm
by bodger
CARB ENGINE 3.5 = inlet opens :36 BTDC closes :64 ATDC / exhaust opens :74 BTDC closes : 26 ATDC
EFI ENGINE 3.5 = inlet opens : 24 BTDC closes :52 ATDC / exhaust opens :62 BTDC closes : 14 ATDC
Posted: Mon May 26, 2008 9:37 pm
by Ralphh85
yeah strange that i have just been lookign in haynes, the 3.5 carb engine has a longter duration cam?? 280deg, 3.5eft 256deg and the 3.9 is 285 deg.
not sure why the efi has a shorter duration??
what kind of duration do the faster cars etc use does anyone know?
Ralph
Posted: Mon May 26, 2008 10:41 pm
by HairbearTE
I am almost sure the Griff 500 engine uses the H234 cam.
Posted: Tue May 27, 2008 9:45 am
by Ralphh85
HairbearTE wrote:I am almost sure the Griff 500 engine uses the H234 cam.
whats the h234 cam??
Ralph
Posted: Tue May 27, 2008 12:05 pm
by RoverP6B
On the Rover P6Bs from 1972 till 1976 running twin SU carburettors, the camshaft duration for both inlet and exhaust was 285 degrees.
Valve timing was...inlet opens 30 degrees BTDC, closes 75 degrees ABDC, exhaust opens 68 degrees BBDC, closes 37 degrees ATDC.
Ron.
Posted: Tue May 27, 2008 12:31 pm
by Rev_erend
Posted: Tue May 27, 2008 1:41 pm
by Ralphh85
cheers for the link.
i like the look of the H224 alot, still shoudl ahve fair bit of bottom end power and does 5500, coupled with a decent bottom end that be good i recon, havign little power till 2500 is a bit much on the H234.
Ralph
Posted: Sat May 31, 2008 6:53 pm
by Ian Anderson
I have a JE102 - said to be 43/79/79/43 302 degrees .500" lift
It does not like running in traffic less than 2000 rpm but from 2500 up slams the seat into my back!
Ian