Hi all, I've bought some 10mm inlet spacers for my car, wat size bolts do I need to replace the originals on the tgv as none were supplied I think they are m6 bolts but don't know wat length I need .
Don't really want to fetch it all apart and measure
Cheers stu

 

Not the answer you want but could take one out and add 10mm,

If they are all same size that is

 

Might just do that. Never even crossed my mind, I was just Goin to take the lot apart
Cheers

 

On a classic 4 x 30 mm and 4 x 50 standard length inlet manifold bolts. It won't do any harm to remove the bolts measure and torque them back up again on a cold engine.

 

It's the long bolts I needed thru tgv on Newage I've sorted it now m8x105 is correct size for 10mm spacers. M8x95 is standard length

 

do these make much of a difference? I've seen them from 10mm to 25mm but never seen any proof they work, same with the header tank spacer thingys

 

Any mod that lowers inlet temps is not going to be a bad thing. Next time I remove my manifold I'll be fitting phelonic spacers.

 

People who have fitted them would claim, inlet feels colder etc. I believe they are fairly pointless. A few comments/questions:

1) How much heat does the air passing through the inlet gather from contact with the manifold? Its flowing very fast remember - at 1 bar, 6000rpm the engine is consuming ~100 litres of air a second. I'll let somebody else do the calculations, but it's not in there very long! Knowing the specific heat capacity of air you'd soon find out that the manifold would have to be a very good radiator to heat the air significantly.
2) Has anybody actually measured the air temperature at the cylinder head? A lower manifold temperature does not mean the air inside is any cooler (see above)
3) Is the manifold actually hot when driving along, or does it warm up after slowing down the car, parking up, popping the bonnet up getting out and then touching it?
4) If the inlet can heat the air up (this is why people fit them), then the converse would be true, in that fast moving air in the manifold would cool it down. Equally when moving fast air coming in the front of the car would also cool it down.


I'd like someone to do the calculations and prove me wrong, but for now the only reason I would fit spacers would be to raise the manifold to get a bigger & better inlet pipe underneath.

 

People who have fitted them would claim, inlet feels colder etc. I believe they are fairly pointless. A few comments/questions:

1) How much heat does the air passing through the inlet gather from contact with the manifold? Its flowing very fast remember - at 1 bar, 6000rpm the engine is consuming ~100 litres of air a second. I'll let somebody else do the calculations, but it's not in there very long! Knowing the specific heat capacity of air you'd soon find out that the manifold would have to be a very good radiator to heat the air significantly.
2) Has anybody actually measured the air temperature at the cylinder head? A lower manifold temperature does not mean the air inside is any cooler (see above)
3) Is the manifold actually hot when driving along, or does it warm up after slowing down the car, parking up, popping the bonnet up getting out and then touching it?
4) If the inlet can heat the air up (this is why people fit them), then the converse would be true, in that fast moving air in the manifold would cool it down. Equally when moving fast air coming in the front of the car would also cool it down.


I'd like someone to do the calculations and prove me wrong, but for now the only reason I would fit spacers would be to raise the manifold to get a bigger & better inlet pipe underneath.

 

Would make good reading always good to see the science behind a mod or else when science proves a mod to be insignificant.

 

Raised mine to get injectors to clear avcs solenoids without having to bodge connectors due to design of fuel rails.
I would rotate turbo first rather than bigger inlet as u still stuck with a 90 bend one end and a dogs leg near the inlet of turbo if u fit bigger inlet