New engine

[Jeff G 78]

Guy, I'm milling 0.050" from the head and I'm going with no shims. I will drill the cam and use the SBC offset bushings to set timing and I'll adjust the guides to get the tension right. I am told this procedure works fine. I hope so...

http://www.summitracing.com/parts/cca-4760

[Diseazd]

That's right, you told me that before.......you'll love that set up Jeff....lots of low end torque! Good luck.....post pics of the mods.

[Stanley]

I'll be looking forward to a thread about the new engine. My mechanic has F1 experience and likes fast-reving engines, he suggested something like this. Of course it will have to wait til I have a big project to work on, no money now. It's a little over my head but I won't be doing any real work - no place to do it.

Also I'm running a Y70 on my 240 - so Oz's build thread was also a big help. I'll start a thread asking about cams etc (got stock C211 cam, nice flat torque line but quits about 5000 rpm, dunno what others are using) for the Y70 after I think about it some more.

[madkaw]

I was playing with the engine calculator and it looked like the chamber size had to be pretty small to get the CR up. What size chambers are you running.

I looked at 40cc chambers and it put me over 10CR. Now a lightened flywheel, triples and a large cam might really make a rev machine.

Congrats on making this work. There's a lot of emphasis on bigger is better, but sometimes it's not about that at all.

[madkaw]

I just re read the thread -9.2 to 1

Personally I would have done 10.2 to 1 with that cam, but again thanks for sharing. I just received a L28 bare block and it makes me think about it!

[Diseazd]

I just received my new .040 over ITM pistons......they're beautiful.....look like factory Nissan. If you need replacement pistons for your Z's or 510's, use these pistons. Let's keep a good supplier of pistons for our cars.

[madkaw]

If I went this route I would step up to forged -rev rev

[jonathanrussell]

Guy,

Where did you buy your ITM pistons?

[Diseazd]

The Nissan dealership in Roanoke. You can usually find the ITM ad on eBay though.

[Jeff G 78]

Guy,

Where did you buy your ITM pistons?

I put flat top ITM pistons in my street L28 and I got them from Black Dragon. I think they were $240 for the set with rings. They carried std and oversize at the time. I assume they still do.

[Diseazd]

Spruell Racing in Atlanta can probably get 'em also Jonathan.....they're in Atlanta......great folks to work with ......I buy my Panasports there....$150.00 cheaper than anywhere else. The ITM's are nice....aren't they Jeff?

[Jeff G 78]

My ITM pistons were great, but I should have thrown the rings away. I'm guessing it was a Black Dragon cheapness rather than an ITM problem, but the rings weren't individually packaged by piston like every other ring set I have ever bought. They were literally all together in one bag with no instructions as to groove positions or top/bottom orientation. They also didn't match any bevel/notch design I have ever seen, so it was anything but obvious. I took my best guess at it and threw them in. I'm convinced better rings would have increased my performance. At the time, I was in a hurry and I didn't have time to order a new ring set. That was about 10 years ago.

I have not heard of any such problems lately with the Black Dragon piston/ring sets, so I think they got their act together.