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914World.com _ 914World Garage _ NPR pistons?

Posted by: tat2dphreak Sep 2 2003, 03:07 PM

saw these on ebay, and stock pistons seem to be getting rare.. are these any good?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2429230809

Posted by: Jake Raby Sep 2 2003, 03:37 PM

They are a decent piston...But I have seen one set up to 23 grams out of balance....double check them all.Also check the piston ring end gaps. I saw some supplied with rings that had .030 out of the box!

Posted by: Charles Deutsch Sep 2 2003, 03:50 PM

They're Japanese (Nippon Piston Ring) which usually means it's good quality.

Posted by: tat2dphreak Sep 2 2003, 04:01 PM

cool! they may be they break I was looking for to get my baby back limping, if not running!

thanks for the info!!

Posted by: Brad Roberts Sep 3 2003, 12:38 AM

Careful. Running these on your 1.7 will mean the heads need to be opened up for the new cylinders. Only the 1.8 and 2.0 heads are direct bolt on with these.

B

Posted by: sj914 Sep 3 2003, 02:18 AM

I had the NPR 96mm big bore kit in my 1.7 and yeah I had to get the heads opened up too. Overall the NPR's held up pretty good to the beating I put them through.

Posted by: Gary Sep 3 2003, 07:18 AM

Passed 20k on my rebuild recently, also NOS NPRs - 66X96 = 1911cc. I did have them dynamically balanced with the rods, crank, flywheel and pressure plate. Makes for a nice smooth ride.

Posted by: tat2dphreak Sep 3 2003, 09:28 AM

guys, these are 90mm... stock 1.7... why do I ned to open the heads up for the same size?

I want to use these until I can save the pennys in my piggy bank to get one of jakes kits for my 1.8 Bus engine and make it a 2056...

Posted by: Dave_Darling Sep 3 2003, 11:29 AM

They were thinking these were 96es... But some 96es fit in the 1.7 heads. They're really really thin, though, and tend not to be reliable.

--DD

Posted by: tat2dphreak Sep 3 2003, 11:56 AM

yea, I've heard about how bad those were... but I was just afraid that these NPRs used a super thick cylindder that wouldn't fit in the 1.7 head...

Posted by: Brad Roberts Sep 3 2003, 12:07 PM

DOH !!.

I did think they where 96's... My bad..

B

Posted by: Charles Deutsch Sep 3 2003, 12:21 PM

We need a Homer Simpson smilie ...

Posted by: Brad Roberts Sep 3 2003, 12:23 PM

The thought of someone actually "building" a 1.7 engine scared me..

Find a free 1.8 and make it a 1911... or find a used bus 2.0 and make it a 2056 with a different cam.

B

Posted by: Gary Sep 3 2003, 01:24 PM

I think the wrist pin is different for the 71mm crank/rods... The 1911 works out nice though...

Posted by: tat2dphreak Sep 3 2003, 02:13 PM

I have a 1.8 already... and when I pull it, the 1.7 will go in until I can turn it into something more respectable... I hadn't thought of 1911cc... I was thinking of buying a kit from Jake and turning the 1.8 to a 2056... but the 1.7 needs to last long enough to get my piggy bank nice a fat!

also I was thinking if I get the 1.7 running right, then I could be patient and wait for someone to convert to a six and buy their 2.0!!! which would make the jump to 2056 much easier!!! (and cheaper) I'm all about cheaper!