high compression setup

[geldartb]

the only specs i have are the specs ben listed on the site. didnt get anything like a cam card.

i have the specs he had listed saved somewhere unfortunately there not on this computer.

227int 233exh
112lsa
108 int 116exh lobe center
322int 322exh lobe lift
.515int .515exh

found the excel file on here again but thats all i ever had for specs.

maybe i can see if Ben can throw something together in the program he's got or something from the old setup of cam's he had before.

[IsaacHayes]

Ask him what it is, he was able to tell me for my cam, which was not on the grind chart.

[geldartb]

sent him a PM so ill be waiting for the response.

damn should have asked him what the difference in power i would make at the higher cr vs what its putting out now. ah well ill ask him when he responds.

[Superdave]

41.5

[ForcedFirebird]

41.5

Valve clearance, or your actual cold quench?

[geldartb]

41.5

mine or yours?

[IsaacHayes]

I found a calculator that computes DCR via cam specs without knowing the IVC, and it's showing your DCR to be way up there Brandon from 12.53:1. It's going to take more than 41.5* if that is what Dave was saying to drop 12.53 down to reasonable levels. I'm at 10.75:1 DCR which works on 93 octane, and I'll be running it on 91 come spring since that's all we have. I just hope it will run ok without pulling a ton of spark. I'll try TR6 plugs to help it out some if I need to and feed it the coldest possible intake charge I can get it.

[bszopi]

We've discussed dynamic compression before (I even built it into the CR calc), but pretty much decided that trying to calculate it still doesn't give you accurate information. So I wouldn't trust those numbers very much...

[Superdave]

Valve clearance, or your actual cold quench?

geldartb's ABDC


I'll measure my clearance in a while...

[gectek]

Fly. Cut.

[IsaacHayes]

Fly Cut? Bartle Doo.

Anyway, I'll do a compression check on my motor once it gets put in come spring time, and see what my cranking pressure is. That will tell me how close those DCR calcs are. Unless I can find a spare starter and battery to crank it over while it's on the stand.. By hand you only get to 70psi because you can't spin it fast enough... The calcs say 10.75 dynamic with 230psi cranking pressure with my cam.

[gectek]

this is supposing you have 100% ring seal? i would not trust any figure like that. the only thing i have seen that is nearly 100% accurate is this

[IsaacHayes]

Well, it will give me a ball park #.... it's all relative. I plan to see what the old 3100 has too right before I pull it out.

[gectek]

flycutting is the best way to get the clearance he needs without too much more monkeying around....

[IsaacHayes]

http://i93.photobucket.com/albums/l55/Kevin_Doe/RX-7/FlycuttingProcess2.jpg

!! Look at that.