kiwicar wrote:"work out some mechanism to apply some pressure to hold them against the cam. "
I think the system is called pushrods, rockers and valve springs ??
Best regards
Mike
That made me spit my beer out Mike
I'm only a Rover V8 guy, so can someone tell me why these link arms are needed please??
Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw
These don´t have any links but a keyway that keeps the lifters inline. These require bronze bushing and I doubt that there is enough material in Rover block to accommodate this setup in a long run.
Oh I wish I could afford Jessel kit loverly kit and such interesting prices, if I put Jessel tappets and rockers on it it would add another 25% to the engine cost of my build (listed elsewhere). A Jessel belt drive (replacing the comp cams belt drive I have ) would add another $1900, nice kit but oh is it pricey!
I have a rev kit on mine but it is just used to hold the tappets in the bores should a rocker or pushrod fail, thus saving the bottom end. The valve springs are 550lb/in the tappet sees these through 1.5 and 1.6:1 ratio rockers, so the tappt "sees" about 820 to 860lb/in of pressure from the valve springs, another 40 to 50 lb in from the rev kit is not of consequence!
The keyway set up is intended for NASCAR sb2 blocks, they are ally with bronze lifter bore inserts, you could adapt the rover to use the same set up, but for the cost of using jessel stuff for the roller cam conversion it would buy you a new LS2 engine outright.
Best regards
Mike
Hi
The Jessel valve gear stuff comes up on Ebay at the end of each season as used. It is actually very good value, but you have to know what you want and know what questions to ask about the stuff listed to make use of it. the problem comes when you need to rebuild it, it is generally totally rebuildable, but the spares are also not cheep, it can end up being a bit of a lottery! As with all NASCAR used kit it generally is about one to four races old, (250 or 1000 miles) but those milea are done at 7500 to 8500 revs at full throttle on 850 bhp 5.7 litre engines, put that kit in a 250 to 350 bhp rover and it will go on for a very long time but it needs checking properly, spares can be difficult and expensive to get, buying one corrillo con rod could set you back $400+ new, a bit upsetting when 8 used ones can be had for $100 or even less, the jessel keyway roller tappets can be had for under $100 a set but replacing one will cost more than that but if you can find two matching sets used you could be onto a real bargin. It is always worth a look at the used NASCAR stuff because it is so cheep for what it is and is generally replaced very early in it's service life. 2 Engine failures in a season can end up with a major team loosing a sponsor, that sponsor could represent $5m+ in sponsorship. . . Jessel roller rockers and Corillo rods look very cheep consumable items when talking about sponsorship loyalty and get replaced well before there is a risk of them failing.
Best regards
Mike
Oh yes!!
They have castors fitted to them dont they
Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw
It is not that bad anymore..?
I call couple of our cam grinder´s here in Finland. They estimate it would be mutch mutch cheaper to buy bolt on item than made some custom cam.. Only cam grinding will cost same as this kit..
Crane cams will sell blank cams for approx 100$ + freight charge 180$ + vat and lifters..
It will be at least same price even if found a cheaper grinder..
And our grinder say that it is not that easy to use chevy cam profile.. He want to measure my block also if start to manufacture those cams.. He spoke some angles etc witch must be measured before grinding..
Or what about automotivecomp roller cam setup, any experience?
