douspray

do the pistons in a hf bottom end have four vavle reliefs or just two?

HMT-Admin

Ya know I could of swore I saw 4 valve reliefs on a D15B6 one time when I threw it in the garbage.. wasnt paying much attention... But, I did a headgasket awhile back on a D15B8 (cx engine) basically a newer version of the HF engine, with 8 valves, and it did have 4 valve releifs on the pistons. I know someone has a write up on this somewhere, I think it was honda-swap.com ?

douspray

thanks for the info! how long do you think it would stand 7-8 pounds with a b7 head on it. i got a whole b6 and i think i'm gonna put it in my sol with the b7 head on it use'n a y8 head gasket while i build my z6.

sohcrxsi

hf rods are tiny, try it, see what happens. get that hf tranny out first though

douspray

i have a del sol, i'm gonna use my trans. i know the rods are tiny i was just wondering if any one had boosted that bottom end with any luck with it stay'n together for a couple of months.

91civicZ6

i know this for a fact. the HF does *NOT* have 4 valve reliefs, it has two.

It is true, however, that the CX engine, D15B8 has 4 valve reliefs like any other 1.5 with flat tops.

I've taken apart two 88 HF engines and both of them had a very slight dome to the piston, and it only had 2 valve reliefs.

OneFastEgg

yes only 2 valve reliefs.. I even seen a set from honder that had two INTAKE ONLY valve reliefs... from an older carb'd honder..