88 Pulsar DOHC on a CA18et Bottom end.

[92gvr4#333]

any thoughts? any one know any of the techinical things about these heads?

[redamnavit]

It will bolt on. The engine you end up with lacks (think?) the crank girdle of a true CA18DET, and the rods won't be quite as strong. You'll need to use the harness and ECU from the DE engine if you're not going standalone. If you have the engines readily available and the time to do it, its an option. The way I see it, in 4-5 years this will be the norm as we'll have run through all the reasonably priced (and/or worthwhile) JDM imports.

There was someone on here that was going turbo on a CA18DE, they might have more specifics on the DE's head. I believe http://www.club-s12.org/ has a few discussions on the conversion you're suggesting as well.

What technical things about the head are you referring to?

[fraz]

You will need different head boltsyou will have to drill and tap the front of the block to hold the lower timing belt pulleyyou will have to change the crank timing belt pulley as the single cam and twin cam CA's run different belt pitch

[McAdam]

besically, what i ran into was the fact that you can use the CA18ET block and use all the CA18DE rotating assembly. the DE crank, pistons, and rods are stronger. and they will bolt into the CA18ET block. the bearings are even the same part number, as I recall. if you want to lower the compression for turbo use, have the piston tops slightly milled, or run double head gaskets. the CA18DE timing belt sprocket will not fit on the CA18ET crankshaft snout. different diameters. thats why it is reccommended that you just use the ET block. hope this helps a little bit

McAdam

[fraz]

The head bolts on the sohc block are M10x1.5mmthe dohc ones are M11x1.5mmthe sohc ones wont fit the dohc head, so you will either have to re-tap the head bolt holes to M11 or get some custom bolts

[evildky]

just wondering if everyone uses newer jdm CA's or if anyone digs out the old CA's from the old USDM sx turbo's

[float_6969]

Most of us got ours imported from Japan. The CA18DET was never available in the US. We did have a FWD CA18DE, but the manifolds and such are different, lacks a crankcase girdle or piston oils squirters.

[evildky]

what about the old CA20 blocks? I can't remember if they had any kind of bracing to support big turbo numbers but they had more displacement

[fraz]

They are 20mm taller, 84.5mm boreno crank girdle, no oil squirtersthe ca20 oil pump wont fit the det crank