14 replies to this topic

[Jovan_Vuksic]

I have an 84 CRX with a 1.5 so I am assuming I have the Canadian DX head right now. The head gasket is blown and I can get an Si head from a salvage yard if I want, which one will be better? In the long run I plan to rebuild this engine with sidedrafts, cam, and porting, which will be better?

Jovan

[bigk3000]

where are you located..

[bigk3000]

and what does your engine code say... its stamped on the chassis right by your radiator cap on a blue metal tag..

EW2 is 1.5 canadian
ev2 is 1.3 canadian

[gtpilot]

Look at the head code - USDM Si = PE7, CDM Dx = PE3, you want the PE3 head. As I recall, the vavles in the PE# are slightly smaller, you can replace them with the Si valves pretty easy. We won't use anything but the PE3 head on our race motors.

If you are looking to do this in one fell swoop, I have a fully race prepped head, camshaft, adjustable cam gear, ported and matched IM and a set of race prepped DCOE 45's with a ton of jets that I would be willing to sell. Drop me an e-mail @ [email protected] and we can talk about all of the parts.

Kirk

Edited by gtpilot, 16 July 2005 - 10:03 AM.

[ian86crxhf]

i've been thinking about changing the cylinder head on my 86 CRX HF.. if i change to the si head and get a new carburetor how much horsepower would i get? do i just go to the junkyard and take the cylinder head off an crx si? what do i do?

[calmoc9]

i missed the part about why the pe3 is better. however, with kirk's reputation i believe what he says. will the pe3 be just as effective if staying fi? although i probably cant afford your whole setup kirk, i would be interested to hear more about the cam and gear. lmk.


i continued to search and found the answer. search function is slowly reaching miracle staus!



scott

Edited by calmoc9, 26 July 2005 - 01:16 AM.

[Omega Mugen]

Is the PE3 head legal in GT lite? Just about anything goes there except the block then, I take it. Other swaps are illegal, right?

[gtpilot]

i've been thinking about changing the cylinder head on my 86 CRX HF.. if i change to the si head and get a new carburetor how much horsepower would i get? do i just go to the junkyard and take the cylinder head off an crx si? what do i do?

<{POST_SNAPBACK}>

Not a good idea as the HF rods are really weak - you'll need a set of DX or Si rods, might as well put in some ARP rods bolts while you are there...

i missed the part about why the pe3 is better.  however, with kirk's reputation i believe what he says.  will the pe3 be just as effective if staying fi? although i probably cant afford your whole setup kirk,  i would be interested to hear more about the cam and gear.  lmk.


i continued to search and found the answer.  search function is slowly reaching miracle staus!



scott

<{POST_SNAPBACK}>

The PE3 head has better quench - it is the shape of a double "D" whereas the SI head the combustion chamber is round, making it easier to build higher CR motors without detonation problems.

The camshaft would need to be used with the head, you wouldn't get away with running it on anything less that the valve train that is in the head...lots of broken parts woudlresult from doing anything else.

Kirk

[calmoc9]

i've been thinking about changing the cylinder head on my 86 CRX HF.. if i change to the si head and get a new carburetor how much horsepower would i get? do i just go to the junkyard and take the cylinder head off an crx si? what do i do?

<{POST_SNAPBACK}>

Not a good idea as the HF rods are really weak - you'll need a set of DX or Si rods, might as well put in some ARP rods bolts while you are there...

i missed the part about why the pe3 is better.  however, with kirk's reputation i believe what he says.  will the pe3 be just as effective if staying fi? although i probably cant afford your whole setup kirk,  i would be interested to hear more about the cam and gear.  lmk.


i continued to search and found the answer.  search function is slowly reaching miracle staus!



scott

<{POST_SNAPBACK}>

The PE3 head has better quench - it is the shape of a double "D" whereas the SI head the combustion chamber is round, making it easier to build higher CR motors without detonation problems.

The camshaft would need to be used with the head, you wouldn't get away with running it on anything less that the valve train that is in the head...lots of broken parts woudlresult from doing anything else.

Kirk

<{POST_SNAPBACK}>

so i would have to use the cdn cam? a colt cam wouldn't work?



scott

[Greg Gauper]

Is the PE3 head legal in GT lite?  Just about anything goes there except the block then, I take it.  Other swaps are illegal, right?

<{POST_SNAPBACK}>

http://www.scca.com/...5GTCategory.pdf

Page 83 in the notes column. It's legal.....

[gtpilot]

Scott,

The profile on the cam that I use would wreak hacovk on any valve train that was not designed for the lift profiles and duration that this cam has...it has nearly 12.7mm of lift! No bottom end and balls to the wall top end.

That said, you can use any cam in the head you want, I just wouldn't use my particualr cam in any head that wasn't prepped to this level.

Kirk

[calmoc9]

it all makes sense now. well the current plan is 86-87 teg pistons, pe3 head, and ill call colt about the cam. has anyone ever come up with a homemade version of the adapter plate for adding electronic advance to an ew4?


scott

[LargeOrangeFont]

Look at the head code - USDM Si = PE7, CDM Dx = PE3, you want the PE3 head.  As I recall, the vavles in the PE# are slightly smaller, you can replace them with the Si valves pretty easy.  We won't use anything but the PE3 head on our race motors.

If you are looking to do this in one fell swoop, I have a fully race prepped head, camshaft, adjustable cam gear, ported and matched IM and a set of race prepped DCOE 45's with a ton of jets that I would be willing to sell.  Drop me an e-mail @ [email protected] and we can talk about all of the parts.

Kirk

<{POST_SNAPBACK}>

Is this setup still available? I may be interested.

[gtpilot]

Is this setup still available? I may be interested.

<{POST_SNAPBACK}>

Yep, drop me a line @ the e-mial address above...

Kirk

[LargeOrangeFont]

Is this setup still available? I may be interested.

<{POST_SNAPBACK}>

Yep, drop me a line @ the e-mial address above...

Kirk

<{POST_SNAPBACK}>

e-mail sent!