cam duration

Ralphh85 · Post by **Ralphh85** » Mon May 26, 2008 5:48 pm

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

ChrisJC · Post by **ChrisJC** » Mon May 26, 2008 8:02 pm

The Range Rover Haynes manual has the open / close angles of the standard cams for carb & EFi engines. I think it's 285degrees.

Chris.

bodger · Post by **bodger** » Mon May 26, 2008 9:09 pm

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

Ralphh85 · Post by **Ralphh85** » Mon May 26, 2008 9:37 pm

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

HairbearTE · Post by **HairbearTE** » Mon May 26, 2008 10:41 pm

I am almost sure the Griff 500 engine uses the H234 cam.

Ralphh85 · Post by **Ralphh85** » Tue May 27, 2008 9:45 am

HairbearTE wrote:I am almost sure the Griff 500 engine uses the H234 cam.

whats the h234 cam??

Ralph

RoverP6B · Post by **RoverP6B** » Tue May 27, 2008 12:05 pm

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.

Rev_erend · Post by **Rev_erend** » Tue May 27, 2008 12:31 pm

This cam data table could be useful :

http://www.btinternet.com/~jon.wolfe/kentcamdata.htm

Ralphh85 · Post by **Ralphh85** » Tue May 27, 2008 1:41 pm

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

Ian Anderson · Post by **Ian Anderson** » Sat May 31, 2008 6:53 pm

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