87 crx upgrade?

[crxdxsi]

i have a 87 crx dx, i have a 87si crx head with ecu,wiring. i want to re-build my d15a (dx) motor (enlarge the piston .020) and put the place the si head block on it to gain more power, this will work?, what about the re-build, what can i do?
someone help me....

[cvcc_wagon]

the head will bolt to the block and give you more power (larger valves, non-CVCC) are you planning on going FI or keep it carb? if you keep it carb you can go to a Weber 32/36 or something like that as the CVCC carb does not perform very well

[crxdxsi]

Hi ,cvcc_wagon
Im going to use the PFI of the same year (87) Si motor, I want to bore the stock cylinder to .20 if this ok?

[lxndr]

You could also bore it out .5mm and use '86/'87 or '88/'89 Integra D16A1 pistons, essentially turning it into a SOHC 1.6L. Also, the '88/'89 pistons will give you more compression (if that's what you want). You should be able to find oversized forged pistons for the D16A1 (I think they are made be Wiseco) that will bring it up to about 1.7L. I'm not sure if there is enough meat on the cylinder walls to go any bigger than that.

Oh yeah, swapping the DX head for the SI is pretty common and it will bolt on without any modifications.

[revhalzoo]

save your money for a ZC swap. interested? go to www.thezcr.com. ask questions, look at the FAQs

[Laser316]

if you would save your money for a zc motor then just save your money for a 1st gen b16. or even a b20a5. go to www.nipponracing.com. they have chep motors with trannys.

[lxndr]

Originally Posted by Laser316

if you would save your money for a zc motor then just save your money for a 1st gen b16. or even a b20a5. go to www.nipponracing.com. they have chep motors with trannys.

I would HIGHLY recommend an '86-'87 D16A1 or D16A1-ZC over a B-series motor. ZC's can be found at Japanese motor importers for around $800-$900 and the USDM D16A1 can be found for just a couple hundred bucks. These motors practically just drop right in and can run off of a stock Civic/CRX SI ECU. If the ZC comes with a transmission then the only other parts needed are the hubs, axles and 1 motor mount from an '86-'89 Integra which in total would cost about $100 from a junk yard. There are no custom parts needed, unlike a B-series swap which requires a B-series ECU, custom wiring harness, custom axles and custom motor mounts. These parts alone are costly enough (about $1,500) without taking into consideration the cost of the B-series motor itself, and if you snap a CV joint you can't just walk in to your local auto supply and pick up a new one.

If you're on a budget then the D16A1 (or ZC) is definitely the way to go! Besides, a D16A1-ZC puts out about 135 HP in stock form (about 115 HP for non ZC). That's like adding 40 HP just by swapping a motor, and yes, there are numerous engine mods can be done to get even more power out of it!

[88novarules]

exactly as he said, plus if u can find an old integra that has a blown engine and buy it cheap for like 100$ you can rob it of its rear brakes as well, and take the ecu.

[Laser316]

Originally Posted by lxndr

I would HIGHLY recommend an '86-'87 D16A1 or D16A1-ZC over a B-series motor. ZC's can be found at Japanese motor importers for around $800-$900 and the USDM D16A1 can be found for just a couple hundred bucks. These motors practically just drop right in and can run off of a stock Civic/CRX SI ECU. If the ZC comes with a transmission then the only other parts needed are the hubs, axles and 1 motor mount from an '86-'89 Integra which in total would cost about $100 from a junk yard. There are no custom parts needed, unlike a B-series swap which requires a B-series ECU, custom wiring harness, custom axles and custom motor mounts. These parts alone are costly enough (about $1,500) without taking into consideration the cost of the B-series motor itself, and if you snap a CV joint you can't just walk in to your local auto supply and pick up a new one.

If you're on a budget then the D16A1 (or ZC) is definitely the way to go! Besides, a D16A1-ZC puts out about 135 HP in stock form (about 115 HP for non ZC). That's like adding 40 HP just by swapping a motor, and yes, there are numerous engine mods can be done to get even more power out of it!

if you would go with the b16 it has a high compression rating. it would be a better motor to boost. then you would almost have doubled the hp then the d16a1

[lxndr]

Originally Posted by Laser316

if you would go with the b16 it has a high compression rating. it would be a better motor to boost. then you would almost have doubled the hp then the d16a1

A lower compression ratio actually works better with a turbo, otherwise you'll blow the head. Check this link for more info.
http://www.muller.net/sonny/crx/compression/index.html

[88novarules]

Originally Posted by lxndr

A lower compression ratio actually works better with a turbo, otherwise you'll blow the head. Check this link for more info.
http://www.muller.net/sonny/crx/compression/index.html

Exactly as he said, usualy when people turbo engines they take the time to buy forged pistons with lower compression. The setup I want to do uses 8.9 compression pistons. This alows the user to have the psi in the 20s safely.