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| supercharger comp ratio https://www.slantsix.org/forum/viewtopic.php?t=52781 |
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| Author: | MOUSETRAP [ Thu Jul 18, 2013 10:52 am ] |
| Post subject: | supercharger comp ratio |
I want to run forged pistons the wiseco long rods are 10.5 comp Options #1 thick like .125 1/8inch or more copper hard gaskets mill nothing off head or block and clean chamber to get it to 8.0 comp #2 custom pistons at $750 and save $$ on head gasket if I ever go non boosted I could then deck block more and shave head to raise comp yet have 7.5 comp now Thanks all as I have read hundreds of posts and just have a few questions |
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| Author: | CNC-Dude [ Thu Jul 18, 2013 3:08 pm ] |
| Post subject: | |
To me, buying custom pistons and still have a huge deck clearance is sort of an oxymoron. Get your pistons made with a near zero deck, but adjust the compression you want with a dish. Then later if you want to run non-boosted, you will only have to cut the head to get a compression gain, and not have to tear down the shortblock to mill both the block and head. You will save a ton of money on the tail end of this scenario by stepping up and getting the pistons made this way on the front end of your build. |
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| Author: | MOUSETRAP [ Fri Jul 19, 2013 3:34 am ] |
| Post subject: | |
So like .040 head gasket and a -45cc dish piston should be about 7.0 compression |
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| Author: | CNC-Dude [ Fri Jul 19, 2013 9:56 am ] |
| Post subject: | |
You don't need that large of a dish, just something to get you in the 8-1/2 compression range. |
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| Author: | MOUSETRAP [ Fri Jul 19, 2013 10:57 am ] |
| Post subject: | |
Option 3 Arp rod bolts stock rods new old set of trw forged pistons Clean cylnder head chamber and a .045 head gasket .. This should be 8.0 compression Can this set up rev to 5500 - 6000 and survive with 5 to 6 psi of boost Cam and exhst and carb would be correct just asking about engine Thanks all |
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| Author: | Dart270 [ Sat Jul 20, 2013 3:12 am ] |
| Post subject: | |
Option 3 should work fine. I have a stock rebuild with 170k miles running 6.5 or 9.5 psi boost (pull cap on wastegate) and revving to 5600 that is surviving just fine. Stock-type cast 0.030"-over Silvolite pistons from 1989 rebuild. Stock replacement rod bolts and had rods resized. Nothing else fancy. Best time 14.27 @99.91 MPH in 3500 lb racewt car with almost stock 2100 stall converter. 330 HP at crank by calculators. Should run mid 13s with better converter and tires. Lou |
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| Author: | turbo66valiant [ Wed Jul 24, 2013 3:37 pm ] |
| Post subject: | |
First of all...once you go boost you never go back. I have the exact #3 option you talk about only my gasket is .046 not .045. Holds up to 33 psi fine. Tons of runs on 27 psi. My new old TRW's weighed in at 462 grams when finished and I shift at 5200 rpm. Later Ryan |
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| Author: | terrylittlejohn [ Thu Jul 25, 2013 12:24 pm ] |
| Post subject: | |
what piston ring do you use? cast, chrome or moly! |
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| Author: | turbo66valiant [ Thu Jul 25, 2013 2:51 pm ] |
| Post subject: | |
Me? Moly Later Ryan |
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| Author: | terrylittlejohn [ Thu Jul 25, 2013 4:46 pm ] |
| Post subject: | |
sorry, yes you ! thanks |
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| Author: | 1974duster kev [ Sun Jul 28, 2013 8:50 pm ] |
| Post subject: | |
i'm running the K1 and weisco setup with .1 thick hunk of copper head gasket a uncut head 53cc?? i'm at 8.6:1 compression my daily driver Kev |
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| Author: | Shaker223 [ Wed Jul 31, 2013 11:32 am ] |
| Post subject: | |
I ended up using the K1 rods and a custom flat top forged piston by Wiesco. Originally, I wanted to use a .045" copper head gasket but ended up with a .073" copper head gasket because I had exhaust piston to valve issues. Comp is 7.9:1 or 7.6:1... I can't remember which and don't have my notes in front of me. I used a modern low drag ring and 22psi of boost to date. |
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| Author: | terrylittlejohn [ Wed Jul 31, 2013 1:21 pm ] |
| Post subject: | |
I was thinking of running the wiseco piston on a stock 225 rod. compression will be in the 6.9/1 range. I emailed Campbell ent and they contacted wiseco for me I was trying to get a piston without reliefs but they considered it a custom piston so price shot up to $800 usd. |
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| Author: | Shaker223 [ Wed Jul 31, 2013 5:28 pm ] |
| Post subject: | |
Wow, my pistons with rings in 2008 were $720. |
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