need some help with 1.8 integra gs stock cylinder head. i need to know which spring is for the exhuast and intake. i was a tool for not paying attention when tearing down the head. any help would be appreciated.

 

exhaust valves are always bigger

 

all the valve springs should be the same.

Please don't tell me you are rebuilding an engine and stuff and reusing stock valve springs. Thats just asking for failure.

If you had lighter valve springs on one side, the lighter would be much more prone to valve float @ higher engine speeds.

 

All valve springs are NOT the same. They have different part numbers for intake and exhaust. I'm not sure which is which on the B18B engine. On B18C1 GS-R engines, the intake side actually has dual valve springs. On the B18C5 Type R engine, all valves have dual valve springs, and the exhaust springs are actually the same (same part number) as GS-R intake valve springs.

 

i'll post up the specs for you:

(B18A)
Valve Spring: Free Length:
IN 42.36 (1.668)
EX 40.09 (1.578)

(B18B)
Valve Spring: Free Length:
IN 41.27 (1.625)
EX 44.32 (1.745)

 

is it just a size difference? I would be surprized to see an actually spring pressure difference.

I'm coming from the pushrod world.

 

I'm sure there is a spring pressure difference. Look at B18C1 engines, which have dual valve springs on the intake side only.

DOHC engines are wayyyy different than pushrod engines with a single cam buried down in the block.