Rockers not fitting after cam?

[MACE]

Why would you put longer pushrods in? Is there a benefit. I would have thought that a longer pushrod to the extent of not letting the rocker bolt down on a bigger cam wouldn't let the valve fully close on a standard cam. Maybe i'm missing something like the action of the hydraulic lifters.

There is a benefit of installing longer pushrods, to a certain extent, as it can increase lifter crush increasing the effective lift at the valve and also to quieten down lazy/noisy lifter.

Going too long though and it will cause the hydraulic lifter to act as a solid and even longer also keeps the valves open all of the time.

The base circle diameter of the cam we supplied is the same as the factory cam so longer pushrod's weren't required to correct any rocker geometry.

From my understanding the other pushrod set was used as one of his factory pushrods was slightly bent (?)

 

[MACE]

Ah one_and_only2004, beat me to the answer

I still think it will be right once you put the right rods in. If it was a 4 valve per cylinder head then i would really be worried, as the valve angle relative to the cylinder can cause them to bend easily

 

[one_and_only2004]

I guess we'll find out tomorrow arvo then - i'll keep you posted on the results.

 

[acarmody]

When I had my engine rebuilt I discovered I needed shorter pushrods, but I had the block decked and the heads shaved so it was a fair bit off. Did you get the heads or block shaved?

 

[one_and_only2004]

Nah the block is stock, and the heads haven't been shaved as they were intended for supercharging.

 

[one_and_only2004]

Turns out it was the pushrods as thought. My ute has an AWESOME lumpy idle to it but runs like an absolute dog above 3000rpm. I rang up chiptorque this arvo and managed to slip in on monday for a dyno tune.

 

[VS_Pete]

good to hear keep us posted after tune good luck

 

[acarmody]

If you don't mind post up or PM me the cost of the dyno tune as I need to take my car back to Chiptorque to get a retune. But yeah post up the dyno sheet when you have it.

 

[one_and_only2004]

Okay I'm back. So I ended up going from 206rwkw to 237rwkw and 490nm of torque. Chiptorque costs $200 an hour for dyno tuning - it cost me $500 for mine to be done. I'll post up dyno sheets when i find myself a scanner.

 

[acarmody]

I just take a picture with my phone since I don't have a scanner.