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#1
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Pistons 9 grams lighter replacement
At the beginning of the season I freshened my IA2 block with new pistons. I weighed one of the old pistons and made the new ones match. I had a problem last year at the end of the season. I have ordered 4 new pistons to replace the damaged ones. I used the job # from the existing pistons that I ordered for it last year. I got them and they are 9 grams lighter for some reason. I decided to weigh the pins to see if I could find some that were a little heavier. As I weighed them I had 6 that weighed 153 grams and 2 that weigh 144 grams. Then I remembered I had 4 pistons that were .005 bigger than the other 4. I assume that’s why I had some lighter pins although I only have 2 that are lighter. This whole time I’ve had 2 pistons assemblies that are roughly 9 grams light. Now with the new pistons I can use the heavier pins to make them match the old pistons with the lighter pins. Problem is I only have 2 light pins. Is it worth getting 2 more light pins so all the pistons assemblies match? Or is 9 grams on 2 of them not worth worrying about? It’s been running for about 6 years with 2 of them weighing different and I haven’t noticed any problems.
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Come take a ride http://www.youtube.com/watch?v=P7Y8Awfk2I0 2008, 2013, 2015, 2016, 2019 Central Il Dragway Mod track champion and 2015 IHRA Div 5 Mod champion |
#2
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I always make all pistons weigh the same and pins all weigh same my machinist gets the the weight difference within 10ths of a gram
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2008KRE Q16 Winner 2014 atco raceway doorslammer winner 86 grand am tube car 8.95 @152 455 eheads solid flat tappet cam Hoffman Racing building and racing Pontiacs for 35 years |
#3
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How did your rod bearings look on those piston and pin combo's, do you still have them to look at?
i could deal with being 4 grams off, but 9 would be a cause for concern to me!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#4
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Quote:
The last time I had it apart I had reused the rod bearing 3 times because they looked so good. It got bored and new pistons this last time so it got all new bearings. The old ones still looked good enough to reuse. I decided to get a couple more lighter pins and call it good. The piston assemblies will all weigh the same now.
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Come take a ride http://www.youtube.com/watch?v=P7Y8Awfk2I0 2008, 2013, 2015, 2016, 2019 Central Il Dragway Mod track champion and 2015 IHRA Div 5 Mod champion |
#5
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Quote:
Brian
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Boobs & bacon |
#6
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Haha!!! True!😜
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Come take a ride http://www.youtube.com/watch?v=P7Y8Awfk2I0 2008, 2013, 2015, 2016, 2019 Central Il Dragway Mod track champion and 2015 IHRA Div 5 Mod champion |
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