High Compression heads?
11-11-2006, 09:46 AM
#3
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Originally Posted by PREDATOR-Z
To answer that, it would be nice to know what type of piston (flat top, domed, valve reliefs size), and in which motor size.
stock LS1
11-11-2006, 10:08 AM
#4
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In that case, 62cc or 59cc chamber heads milled would achieve that. Notching pistons would be required to fit bigger cams.
To be more specific 57cc with .040 gaskets will yield 12.1:1
Just be aware that DCR should be taken into consideration to run pump fuel, but if race fuel (or other) available with enough octane it is not that hard.
To be more specific 57cc with .040 gaskets will yield 12.1:1
Just be aware that DCR should be taken into consideration to run pump fuel, but if race fuel (or other) available with enough octane it is not that hard.
11-11-2006, 10:14 AM
#6
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Thanks for the answer... I want to use a 224/228 cam. Do i have to Notch the pistons?
I have talked with AFR about the 205 heads milled down to 58cc. But i´d want to see whats more on the market.
What do you "high comp guys" use and have you had any problems?
I have talked with AFR about the 205 heads milled down to 58cc. But i´d want to see whats more on the market.
What do you "high comp guys" use and have you had any problems?
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11-11-2006, 10:23 AM
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your dcr will be through the roof with a 224/228. i had 9.0 dcr with 11:7 scr with a 228 on a 112 +2. it ran fine on 93 but i have no idea how that e85 stuff is.
11-11-2006, 10:25 AM
#9
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Originally Posted by slow trap
but i have no idea how that e85 stuff is.
With an octane of 105 i dont think there should be any problems.
What type of heads and cc do you use?
11-11-2006, 11:05 AM
#10
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RUNN,
DCR is dynamic compression. On a 105 Octane, 9>9.2 DCR would be the max I would run. To find your DCR first you need to give us at what LSA and ICL would the cam be. Based on that, you choose your CC on heads. Differen LSA and ICL will reduce or augment DCR.
DCR is dynamic compression. On a 105 Octane, 9>9.2 DCR would be the max I would run. To find your DCR first you need to give us at what LSA and ICL would the cam be. Based on that, you choose your CC on heads. Differen LSA and ICL will reduce or augment DCR.
11-11-2006, 11:49 AM
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The stuff I wanted to know in my thread, but no answers yet...they must like you better than me 
So it takes a 57cc head to reach 12:1 huh...don't think you can mill much more than that?
The cam in question here is a 110+0 grind.
So it takes a 57cc head to reach 12:1 huh...don't think you can mill much more than that?
The cam in question here is a 110+0 grind.
11-12-2006, 12:57 AM
#14
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Originally Posted by PREDATOR-Z
RUNN,
DCR is dynamic compression. On a 105 Octane, 9>9.2 DCR would be the max I would run. To find your DCR first you need to give us at what LSA and ICL would the cam be. Based on that, you choose your CC on heads. Differen LSA and ICL will reduce or augment DCR.
DCR is dynamic compression. On a 105 Octane, 9>9.2 DCR would be the max I would run. To find your DCR first you need to give us at what LSA and ICL would the cam be. Based on that, you choose your CC on heads. Differen LSA and ICL will reduce or augment DCR.
224/228 .581.588@114 this is the cam... What cc should i have on AFR 205 heads?
11-12-2006, 01:29 AM
#15
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BTW did you read the link here https://ls1tech.com/forums/showpost....2&postcount=52 about an engine with 19:1 that runs on E85, And the cars in Brazil use 15:1 to 16:1 but i dont know the DCR on those
But E85 is different than gas since E85 cools the intake charge more and therefore it´s more knock-resistent and can tolerate more boost or a higher CR. And it also makes the engine run cooler and to some degree, even safer.
On e85 you cant only look at the octane.
I dont know, Damn we need more info on this
But E85 is different than gas since E85 cools the intake charge more and therefore it´s more knock-resistent and can tolerate more boost or a higher CR. And it also makes the engine run cooler and to some degree, even safer.
On e85 you cant only look at the octane.
I dont know, Damn we need more info on this
11-12-2006, 02:55 AM
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Originally Posted by Runn
Thanks for the help...
224/228 .581.588@114 this is the cam... What cc should i have on AFR 205 heads?
224/228 .581.588@114 this is the cam... What cc should i have on AFR 205 heads?
It needs to be on a 110.
11-12-2006, 03:19 AM
#17
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Originally Posted by BlackHawk T/A
That cam does not fit the "torque cam" description that you mentioned at all.
It needs to be on a 110.
It needs to be on a 110.
I´m not sure of what cam i should use 
I just figured it would be a good choice since AFR heads have gotten good numbers with it, i think AFR 6016 is the correct name.But what cam should we (you and i
)use to get a high DCR that we want. This is an interesting thread https://ls1tech.com/forums/generation-iii-internal-engine/481382-torque-coming-out-my-ears-cam-change.html
" I asked Thunder Racing to grind me up a Super Torquey cam that would have excellent street manners. Here's what they came up with:
224/228 .637/.639 110LSA (+0)."
"My dynamic compression has risen from 8.34:1 to 8:73:1!"
That might be a much better choice.
11-12-2006, 03:41 AM
#19
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I´ve posted a couple of questions about DCR with E85 on a couple of forums, See if i get any respons.
But if we look at FI cars that have swithed to E85 they can increase there boost way more over gas so i dont think why it shouldn´t be the same on NA. I think a DCR over 9:1 shouldn´t be any problems but it would be nice to have some facts
But if we look at FI cars that have swithed to E85 they can increase there boost way more over gas so i dont think why it shouldn´t be the same on NA. I think a DCR over 9:1 shouldn´t be any problems but it would be nice to have some facts
