Mini Me Swap Compression Question
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Mini Me Swap Compression Question
Ok, about this time last year, I swapped a Y8 head onto my Y7 block due to a long-going battle with a blown head gasket and warped Y7 cylinder head.
SO, a year later with no running problems at all and decent gas mileage (30+) on REGULAR 87 GAS, I come across this:
http://www.knology.net/~jediklc/D.htm
Curious as to my compression ration on my car, I input my numbers as so (the values to the right are automatically calculated)
Block: D16Y8-D16Y7
Head: D16Y8-D16Y7
Piston: P2E-000 (USDM D16Y7)
Piston to Deck Height-OEM D16Z6-D16Y7
Head Gasket Thickness: now this is where I might be a little off on my numbers...I got the Head Gasket from O'Reilley's (a Felpro gasket compatible with both the Y8 and A6 motor, so should I enter the value for the 2 layer Y8 gasket or do you think it's the Y8-A6 gasket?)
The type of gasket makes a difference because if it's the A6-Y8 gasket, my compression is ~9.6:1
If it's the Y8 2 layer gasket, then my compression is ~10.2:1 (and I should probably be using premium gas)
I'm not experiencing any knocking and never have, and even running 1 degree advanced timing with no issues. But the head was milled/smoothed ~.001 of an inch (nowhere near the casting marks on the head) so not sure if that tiny amount would matter that much....
Am I good with my setup or should I confirm that headgasket thickness first?
^^;
OR is that 10.2:1 WAY too high?
XP
SO, a year later with no running problems at all and decent gas mileage (30+) on REGULAR 87 GAS, I come across this:
http://www.knology.net/~jediklc/D.htm
Curious as to my compression ration on my car, I input my numbers as so (the values to the right are automatically calculated)
Block: D16Y8-D16Y7
Head: D16Y8-D16Y7
Piston: P2E-000 (USDM D16Y7)
Piston to Deck Height-OEM D16Z6-D16Y7
Head Gasket Thickness: now this is where I might be a little off on my numbers...I got the Head Gasket from O'Reilley's (a Felpro gasket compatible with both the Y8 and A6 motor, so should I enter the value for the 2 layer Y8 gasket or do you think it's the Y8-A6 gasket?)
The type of gasket makes a difference because if it's the A6-Y8 gasket, my compression is ~9.6:1
If it's the Y8 2 layer gasket, then my compression is ~10.2:1 (and I should probably be using premium gas)
I'm not experiencing any knocking and never have, and even running 1 degree advanced timing with no issues. But the head was milled/smoothed ~.001 of an inch (nowhere near the casting marks on the head) so not sure if that tiny amount would matter that much....
Am I good with my setup or should I confirm that headgasket thickness first?
^^;
OR is that 10.2:1 WAY too high?
XP
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Re: Mini Me Swap Compression Question
I think after a year you should be good regardless of what numbers that thing is spitting out. Never heard anyone one this forum report any negatives doing one of these swaps regarding compression.
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Re: Mini Me Swap Compression Question
Heh, thanks
Ok, got some numbers straight:
Apparently, that "2 layer Y8 gasket" is "made" by removing the middle layer of the OEM three layer gasket (which I did not do)
The OEM three layer gasket sits at .037...
So, according to the calculator, my compression should be setting at ~9.96:1
(so with the milled head somewhere around 10:1 but now I'm just doing guesswork)
^^;
Soo...yeah, I guess I'm ok with what I'm running on Regular gas
That calculator just freaked me out a bit ^^;;
One year and about 8000 miles later and no issues!
*knocks on wood*
Thanks for the input, grumblemarc
Ok, got some numbers straight:
Apparently, that "2 layer Y8 gasket" is "made" by removing the middle layer of the OEM three layer gasket (which I did not do)
The OEM three layer gasket sits at .037...
So, according to the calculator, my compression should be setting at ~9.96:1
(so with the milled head somewhere around 10:1 but now I'm just doing guesswork)
^^;
Soo...yeah, I guess I'm ok with what I'm running on Regular gas
That calculator just freaked me out a bit ^^;;
One year and about 8000 miles later and no issues!
*knocks on wood*
Thanks for the input, grumblemarc
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