Do you RR bolts strech?

[TI3VOM]

Hi there mate I was wanting to know what kind of bolts you use with you're rocker packages?

The store I got mine from ordered some mixed ratio ones for me. When I picked them up they said to make sure to put the higher ratio ones on the exhaust valve.

Long story short I have a VT V6 N/A so I want to put the higher ratio on the intake valve.

Do the bolts you supply with you're RR's stretch? Would I need to use new bolts. If so how much would it cost to get some?

Cheers
Glenn.

[acarmody]

Are you sure you can put the higher ratio ones on the intake? Wouldn't it have been better to get all one ratio?

I thought the reason you got higher ratio for the exhaust is because the air is being forced down into the engine under pressure by the supercharger, but it doesn't have that benefit on the exhaust cycle so it increase the lift of the exhaust valve to allow it more space to escape.

[TI3VOM]

Cheers for that acarmody.
I understand what the higher ratio on the exhaust with a supercharged engine does, it helps bleed off the boost inside the cylinder, to help fit more mix in next time round.

When I bought them I said I wanted some 1.9 ratio roller rockers, when they arrived they had ordered a mixed ratio set. I was not fussed as either way there would be gains and being mixed ratio's there would be the tiniest bit more gain.
But as I was leaving the guy said to make sure the 1.95's go on the exhaust side, he did not ask whether it was supercharged or not, so I did just that.

But being N/A it would have been better to put the 1.95's on the intake side, as the exhaust has the force of the explosion behind it to push it out, where as the intake just has the amount of lift (I think).

I just need to know if the bolts stretch?

[immortality]

what type of bolts are they? if they are cap screws then they are re-usable. if they are the factory style bolts then get some caps screws. the re-useable bolts that Intense racing from US supply are just cap screws

all bolts stretch. it's the amount that you stretch em that dictates whether or not they are re-usable

[TI3VOM]

Can't say I know what type they are, that's why I was asking the bloke from YT. Is there a way to tell the difference?

[acarmody]

I don't know if this will help, the left two are factory bolts, and the right one is my reusable bolt, available from any bolt store for about 50 cents each, better than about $5 each for Holden one time use bolts.

[TI3VOM]

Ill have to have a look, as I installed the rockers 1 year ago, but I'm sure they came with the reusable bolts.
Cheers for the help guys.

[MICKY.D]

The bolts used in our rocker sets are unbrako socket head cap screws.

The 5/16 bolts used on V6/V8 engines are rated to handle 400. ft lbs, i have re-use the same bolts many times, i only get new ones if they look like they are damaged or stripped, shouldnt be an issue at all to re-use them

Cheers
Mike

[vxcalais_01]

Cheers for that acarmody.
I understand what the higher ratio on the exhaust with a supercharged engine does, it helps bleed off the boost inside the cylinder, to help fit more mix in next time round.

When I bought them I said I wanted some 1.9 ratio roller rockers, when they arrived they had ordered a mixed ratio set. I was not fussed as either way there would be gains and being mixed ratio's there would be the tiniest bit more gain.
But as I was leaving the guy said to make sure the 1.95's go on the exhaust side, he did not ask whether it was supercharged or not, so I did just that.

But being N/A it would have been better to put the 1.95's on the intake side, as the exhaust has the force of the explosion behind it to push it out, where as the intake just has the amount of lift (I think).

I just need to know if the bolts stretch?

Same principal as mild cam and head work on Naturally Aspirated..... air out of the heads through the exhaust valves is the key to making some power. Correct me if i am wrong.