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| Is this +60 oversized? https://www.ausmini.com/forums/viewtopic.php?f=2&t=91236 |
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| Author: | Jenk [ Tue Dec 08, 2015 7:04 pm ] |
| Post subject: | Is this +60 oversized? |
I took the head off the engine today to have some work done on it and also to figure out if the block had been bored before so I cleaned the carbon off one of the pistons to unearth the below... is this 60 thou over?? if so what does that make the capacity... 1330? |
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| Author: | TK [ Tue Dec 08, 2015 7:15 pm ] |
| Post subject: | Re: Is this +60 oversized? |
yes yes |
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| Author: | Karcraft [ Tue Dec 08, 2015 7:48 pm ] |
| Post subject: | Re: Is this +60 oversized? |
The piston is a Hepolite Cooper S piston. 9.75:1 compression ratio on a standard bore. 2 compression rings and one oil ring. A good quality UK made piston. Hope this helps. |
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| Author: | Jenk [ Tue Dec 08, 2015 7:52 pm ] |
| Post subject: | Re: Is this +60 oversized? |
Karcraft wrote: The piston is a Hepolite Cooper S piston. 9.75:1 compression ratio on a standard bore. 2 compression rings and one oil ring. A good quality UK made piston. Hope this helps. thanks but now I'm confused if its a standard bore why does it have +60 on it? so you're saying its 1275? |
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| Author: | Karcraft [ Tue Dec 08, 2015 8:27 pm ] |
| Post subject: | Re: Is this +60 oversized? |
All compression ratios are worked out on a standard bore. 1275 bore is 2.780". Standard size 21253 pistons = 9.75:1 +060" = 1327cc. With no head work,etc comp ratio wld be about 11:1 . You would need see see what head volume you have (std is 21.4cc) plus deck height and bowl size. |
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| Author: | Jenk [ Tue Dec 08, 2015 8:31 pm ] |
| Post subject: | Re: Is this +60 oversized? |
Karcraft wrote: All compression ratios are worked out on a standard bore. 1275 bore is 2.780". Standard size 21253 pistons = 9.75:1 +060" = 1327cc. With no head work,etc comp ratio wld be about 11:1 . You would need see see what head volume you have (std is 21.4cc) plus deck height and bowl size. Awesome thanks. |
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| Author: | gtogreen1969 [ Tue Dec 08, 2015 8:35 pm ] |
| Post subject: | Re: Is this +60 oversized? |
I have the same pistons in my car and I have just cleaned up the head and cc'd it. My head has only had a mild skim and the chambers measured around 20cc. A 40 thou head gasket gave me 11.5 to 1 CR and with a 60 thou head gasket I got 11 to 1 CR. I use this calculator http://www.gtsparkplugs.com/CompRatioCalc.html |
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| Author: | Jenk [ Wed Dec 09, 2015 6:14 am ] |
| Post subject: | Re: Is this +60 oversized? |
gtogreen1969 wrote: I have the same pistons in my car and I have just cleaned up the head and cc'd it. My head has only had a mild skim and the chambers measured around 20cc. A 40 thou head gasket gave me 11.5 to 1 CR and with a 60 thou head gasket I got 11 to 1 CR. I use this calculator http://www.gtsparkplugs.com/CompRatioCalc.html Thanks gtogreen.... that's a handy calculator. |
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