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1.7l rockers 2.o motor
Posted: Fri Feb 02, 2007 1:05 pm
by olivajeep
what is the advantage of going with 1.7l rocker assemblys in a 2.0 head what i have read is that it will raise the rpm level. is this realy worth the hassl and what kind of gains are you looking at. also what parts do you need to do this. i think the higher rpm redline would be great for highway driving with the stock gearing in the 901 tranny.
Posted: Fri Feb 02, 2007 2:38 pm
by raygreenwood
It allows you to use the Porsche 911 style swivel feet adjusters. They allow much better valve adjusting geometry and lower wear. Very worthwhile improvement. I would call all of those gains. Ray
Posted: Fri Feb 02, 2007 8:33 pm
by olivajeep
what is needed to do this. rocker, rocker shaft, studs or is there more to it then that.to me it seams to be a bolt on deal or is there machine work needed.
Posted: Sat Feb 03, 2007 7:44 am
by Dave_Darling
Bolt-on if you're just talking about the rocker arms. Use the shafts from the engine the rocker arms are from, as they are all "used" to each other.
To use the 911 adjusters, you will have to deck the face of the rocker arms with a mill by about 0.060", and you will probably have to put some shims between the rocker shaft mounts and the head. That falls under the category of "setting up the rocker arm geometry", which can be a bit involved...
--DD
Posted: Sat Feb 03, 2007 10:12 am
by olivajeep
do you think some stronger studs for the rocker shafts will be in order.
Posted: Wed Sep 19, 2007 9:49 pm
by Piledriver
olivajeep wrote:do you think some stronger studs for the rocker shafts will be in order.
Yes, the factory 7mm setups is junk. Jake sells the HD studs and solid spacer sets, as well as the 911 adjusters (REAL Porsche ones)
He even sells the whole shot already done as a kit.
(Whoops, old post.. Better late than never?)