16 replies to this topic

[jsgprod]

if you are going to shop for a head go and bug some of the canadian members for a ew2 head for your car.

The si head on the carby block lowers compression.

Although I have put a si head on a carby block and it ran fine.. Its wasnt this end of the world craziness that some people think may happen.

Ps I have 2 86 si ecus if you want one.

True....and not true at the same time .

I agree that the Si head on a DX bottom end will indeed end up with a lower CR than the DX originally began life with. The thing is, it will also, with no other changes being made, give you an Si with a higher CR than 'IT' came with! Only drawback it (Si head on a DX) has is that it 'supposedly' has a less than optimum flame front in the combustion chamber. Or at least that's what I was told by someone back in the 80's.

Never bothered to put a camera in my combustion chamber to check it though!

Jay
Who's done the carbs on a DX w/Si head a LONG time ago....but preferred the fuel injection over carbs.

[hon_da_nut]

You should swap the head if you're going to all this trouble. Plus the carbed head has the cvcc ports on the intake side that the FI intake manifold doesn't cover.

So a carbed motor won't run with FI mani on it? That sucks I just bought an 87 carbed crx motor to ride on while i rebuild. Well i guess it'll be for sale.