Alu-pushrods (aircooled.net)

[Jordy/DVK]

 Why do most of you use chromemoly pushrods and not lighter ones like the aluminium performance pushrods from aircooled.net?
 Aren't they up to their task, or are people just a bit scared to use aluminium ones?
 Just wondering...

 Cheers, Jordy
 

 

 

 

[Jordy/DVK]

 Even the double-tapered ones?

[Jim Gillum Racing]

I've been using aircooled.net's aluminum p/r's since 2000.  My valve size is 46 X 38 and I'm using small big block Chevy springs set at 150 lb. on the seat.  The cam is a CB Perf. K8 with 1.4 rockers and .534 lift.  I also have titanium retainers and keepers and CB's 28mm light weight lifters that I lightened up some more.  The engine see's 7400 rpm's during the burnout and I launch at 7200 and shift at 7000.  The engine has a little over 300 passes on it and it runs like new.  Aircooled.net's p/r's ROCK !

[richie]

I have seen the dual taper ones mushroom at the ends and the tips come out,not pretty,the engine proberly didnt have enough spring pressure,but thats the idea of lightweight parts right? cheers richie,uk

[Jon]

thats the idea of lightweight parts right?

Yes thats the idea, but who knows much pressure you can back of by using the trick of the week?
Or what to have in the first place 

[Jordy/DVK]

 btw. Why dont the put a spring at the lifter, it's the heaviest part in the valvetrain and the spring pressure needed to keep it following the cam has to go through the retainers, rockers, and pushrods. Wouldn't putting a spring at the lifter decrease the forces/pressure on and in the pushrods a lot?

 Just an idea?

[Jim Gillum Racing]

 btw. Why dont the put a spring at the lifter, it's the heaviest part in the valvetrain and the spring pressure needed to keep it following the cam has to go through the retainers, rockers, and pushrods. Wouldn't putting a spring at the lifter decrease the forces/pressure on and in the pushrods a lot?

 Just an idea?

Spring kits for roller cams are very common.  Because cam profiles are so radical on roller cams, spring kits are installed in the lifter valley of V-8's above the lifters.  The first time I saw this was in 1963 on a Chevy 409.