AU XR8 220 heads, how many cc's?

crakrz · 19-07-2009, 08:13 PM

Just wondering if anyone can tell me how many cc's the Yella Terra modified GT40p heads are? And how much can be removed of the decks safely?

Thanks,

-Craig

RG · 21-07-2009, 09:59 AM

58cc IIRC, and not too much. Compression is already in the 10's.

CRAIGAU3220 · 21-07-2009, 09:45 PM

Quote:

Originally Posted by RG

58cc IIRC, and not too much. Compression is already in the 10's.

I thought compression is 9.4

RG · 21-07-2009, 09:50 PM

Quote:

Originally Posted by CRAIGAU3220

I thought compression is 9.4

That was the 185 and 200, it was bumped up to mid 10's for the 220.

crakrz · 23-07-2009, 08:06 PM

Well I spoke to Yella terra today, they weren't sure of how many cc's the chambers are, but they took .020" of the heads. They said that they are safe to take off another .020" but cam choice and piston to valve clearance can become an issue.
As well as the machining done in the combustion chambers and ports, they also told me that they machined the spring bases too, but that was more to suit the springs that were bieng used as they interfered with the guide boss or the step on the spring base, or something similar to that. They couldn't tell me what springs were used as they just got the machining dimensions.

As for the comp ratio, all the specs that I have, from the service book and original brochure tell me that the 220kw motor was 9.4:1.

I know that there are some really knowledgeable people on these forums that can either verify, expand or correct the info that I have been given. So feel free to pick the crap out of it.

Thanks,

Craig.

BlacklistedXR · 23-07-2009, 08:26 PM

Quote:

Originally Posted by crakrz

Well I spoke to Yella terra today, they weren't sure of how many cc's the chambers are, but they took .020" of the heads. They said that they are safe to take off another .020" but cam choice and piston to valve clearance can become an issue.
As well as the machining done in the combustion chambers and ports, they also told me that they machined the spring bases too, but that was more to suit the springs that were bieng used as they interfered with the guide boss or the step on the spring base, or something similar to that. They couldn't tell me what springs were used as they just got the machining dimensions.

As for the comp ratio, all the specs that I have, from the service book and original brochure tell me that the 220kw motor was 9.4:1.

I know that there are some really knowledgeable people on these forums that can either verify, expand or correct the info that I have been given. So feel free to pick the crap out of it.

Thanks,

Craig.

9.4:1 is the correct compression for the AU 220 XR8s:
http://www.fpv.com.au/theheritage/fa...onxr8-220.aspx

RG · 23-07-2009, 08:38 PM

Ha, wonder where I got 10's from.

As for springs what ever they were they weren't real good, spring breakages are common on them and even on T3's.

Mine had a bit taken off them (unsure on exactly how much) and I was running flat top pistons that weren't notched along with a Crow 621354 cam and I had no issues with PTV clearance.

What exactly are you planning on may I ask?

Mr_4.0 · 23-07-2009, 09:16 PM

whats actually required to put gt40 heads on and e-series motor.

obviously inlet manifold. but what about lifters, cam etc? is sticking the e-series MAF sensor in the au housing going to work ok?

im looking at an ef 5l, and i have a mate selling gt40 heads, extractors, and inlet manifold. i want to put a cam in there at the same time though.
also, different plugs?

sorry to high jack this thread, lol

crakrz · 23-07-2009, 10:25 PM

Quote:

Originally Posted by RG

What exactly are you planning on may I ask?

My XR8 is going on the rollers @Bluepower on Aug 3rd to tidy up the tune a bit and make a few changes, and since this was a few weeks away, I was planning on doing a cam change- Crow 621371, plus springs, retainers, and reco the GT40's, bit of bowl work, tidy up the short turn, raise the comp a bit more. I'm not after a street fighter or anything, just thought I'd get it going a bit better, the way it should have been from the factory. And since I'm a former engine reconditioner in a previous life, the work would be pretty straight forward for me to do.
I have since spoken to Chris at Bluepower, he thinks that I'm better off saving my $$ for now and build a stroker properly from the start. I'm certainly inclined to listen to his advice. And since I can build it myself, It won't cost the earth. Anyone got any opinions on this.......?
But Russell, getting back to your original question, I just thought that I would post up the information I had found for the benefit of the readers.

-Craig.

RG · 23-07-2009, 11:53 PM

Quote:

Originally Posted by crakrz

My XR8 is going on the rollers @Bluepower on Aug 3rd to tidy up the tune a bit and make a few changes, and since this was a few weeks away, I was planning on doing a cam change- Crow 621371, plus springs, retainers, and reco the GT40's, bit of bowl work, tidy up the short turn, raise the comp a bit more. I'm not after a street fighter or anything, just thought I'd get it going a bit better, the way it should have been from the factory. And since I'm a former engine reconditioner in a previous life, the work would be pretty straight forward for me to do.
I have since spoken to Chris at Bluepower, he thinks that I'm better off saving my $$ for now and build a stroker properly from the start. I'm certainly inclined to listen to his advice. And since I can build it myself, It won't cost the earth. Anyone got any opinions on this.......?
But Russell, getting back to your original question, I just thought that I would post up the information I had found for the benefit of the readers.

-Craig.

If I were you I'd listen to Chris, mine is on it's way to him on Saturday for a fix and freshen up. If you can build it yourself maybe it's an idea to pull one from a Fairmont if you want to use a stock block or if you have the $$$ buy an aftermarket block and build it up as you have the time and money. That way once it's done it can be a quick change over and you still get to enjoy your car while it's being built.

EvilChief · 24-07-2009, 09:28 AM

Quote:

Originally Posted by RG

Ha, wonder where I got 10's from.

Holden LS series probably, all of those engines are in the 10s

FTe342 · 24-07-2009, 11:04 AM

Quote:

Originally Posted by crakrz

I have since spoken to Chris at Bluepower, he thinks that I'm better off saving my $$ for now and build a stroker properly from the start. I'm certainly inclined to listen to his advice. And since I can build it myself, It won't cost the earth. Anyone got any opinions on this.......?
But Russell, getting back to your original question, I just thought that I would post up the information I had found for the benefit of the readers.

-Craig.

This should wet your appetite http://www.fordforums.com.au/showthr...1265549&page=2

particularly post #36