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View Full Version : valve springs: Intake vs Exhaust

ryan89crx
11-19-2006, 11:25 AM
alright, when i disassembled my head i didnt bother marking which springs were intake and which were exhaust. they both looked the same, dimension wise, so i jut threw them all in a bag and called it good. now i come to reassemble the head, and some of the spring have yellow paint on them and some dont. according to hondaautomotiveparts.com, they are also different part #s....

which is intake, and which is exhaust? damn...

http://img.photobucket.com/albums/v203/ryan89crx/build/valvespring.jpg
88cr-rex
11-19-2006, 11:57 AM
Hmm . . . mine off my PM6 head look exactly the same. Guess you need to find someone with a valve spring pressure tester . . . couldn't even guess which side would need more on the seat.

You do remember which side is top though right?
" Low "
11-19-2006, 11:58 AM
bump for answers...... sorry to hear about the mix up...!
s_18
11-19-2006, 12:40 PM
Measure their free length. The longest ones are exhaust springs.
Not much difference, but if you look at the average, you should reach a conclusion.
Mixelplix
11-19-2006, 12:41 PM
I don't know what motor you have, but for a A6 the exhaust valves are longer than the intake valves. (115MM intake, 118MM exhaust) I can't find dimensions on the springs.

Are they all exactly the same size?

-Des!
ryan89crx
11-19-2006, 12:48 PM
well i pulled the VC off my spare a6, and the yellow ones were intakes.

measured them again(did it by eye the first time) and they were definately different

thanks guys :TU:
transzex
11-19-2006, 02:47 PM
ISKY's for $108 :)
ryan89crx
11-19-2006, 03:58 PM
ISKY's for $108 :)where?
Hellhatch
11-19-2006, 05:02 PM
I know my y8 intakes have a stiffer rating than the exhaust.
transzex
11-20-2006, 02:14 AM
where?

Straight from ISKY, cheaper than Exospeed......

but you'll also need the exhaust locaters for $30
Belette
12-31-2006, 02:41 PM
Any vtec intake springs are stronger than exhaust, core of coil bind is .018 beefer. It's where you can get something stronger maybe 10-15% even more if you put shim under but take really care to check coil binding when valve is wide open.

I put 2 set of 8 intake valve spring instead of y7 ones on both intake and exhaust, they are not longer but bigger core. I will try it with delta 282 shen I get it back from regrinding.