Higher Compression
06-10-2003, 01:52 PM
#1
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Higher Compression
currently, i have a sohc vtec motor sporting a mild 110whp. now, before i drop a grand on new rods, pistons, block gard, ect to raise the compression to 11.1. i want to know what kinda power to expect on the dyn?. i know its impossible to say exactly but im just looking for a ballpark figure.
and to all who will say "save your money and buy a b", i got one already.
thanks in advance
and to all who will say "save your money and buy a b", i got one already.
thanks in advance
06-10-2003, 01:54 PM
#2
Honda-Tech Member
Re: Higher Compression (Kronic)
Going from 9.6:1 to 11.1:1 compression will yeild in about 10whp.
Why waste a grand? Get some flattop D15 pistons and drop those in.
PM3's to be exact. 11.1:1 compression in a D16Y8.
P2P (Y8) Pistons.
P03/PM3 Pistons
OR get stuipd with the PDN's (Civic GX)
Why waste a grand? Get some flattop D15 pistons and drop those in.
PM3's to be exact. 11.1:1 compression in a D16Y8.
P2P (Y8) Pistons.
P03/PM3 Pistons
OR get stuipd with the PDN's (Civic GX)
06-10-2003, 01:59 PM
#3
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Re: Higher Compression (Spade)
better make you clay that motor. 88-95 non vtec valve reliefs do not match up with vtec valve spacing. i know plenty of people running it with it no problems but id do it anyway to be safe.
06-10-2003, 02:01 PM
#4
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Re: Higher Compression (JaeOne3345)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JaeOne3345 »</TD></TR><TR><TD CLASS="quote">better make you clay that motor. 88-95 non vtec valve reliefs do not match up with vtec valve spacing. i know plenty of people running it with it no problems but id do it anyway to be safe.</TD></TR></TABLE>
Agreed.
Agreed.
06-10-2003, 02:07 PM
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Re: Higher Compression (Spade)
damm, i knew if anyone would reply, it would be you spade. thanks!
10whp, not what i was expecting to yield. witch d15 do i get the pistons from? i know 11.1:1 compression is going to use more gas but is it still streetable? how much more gas?
10whp, not what i was expecting to yield. witch d15 do i get the pistons from? i know 11.1:1 compression is going to use more gas but is it still streetable? how much more gas?
06-10-2003, 02:31 PM
#6
Honda-Tech Member
Re: Higher Compression (Kronic)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kronic »</TD></TR><TR><TD CLASS="quote">damm, i knew if anyone would reply, it would be you spade. thanks!
10whp, not what i was expecting to yield. witch d15 do i get the pistons from? i know 11.1:1 compression is going to use more gas but is it still streetable? how much more gas?</TD></TR></TABLE>
Not much more fuel....more compression...you need to use the higher octane fuels. 91+
I say 10whp because I am being soft.
And get the PM3/P03 pistons.....Take your pic from the D15B2, D15B7, or D15B8, do not use D15Z1 pistons as I don't have the specs on them and know that they are different.
10whp, not what i was expecting to yield. witch d15 do i get the pistons from? i know 11.1:1 compression is going to use more gas but is it still streetable? how much more gas?</TD></TR></TABLE>
Not much more fuel....more compression...you need to use the higher octane fuels. 91+
I say 10whp because I am being soft.
And get the PM3/P03 pistons.....Take your pic from the D15B2, D15B7, or D15B8, do not use D15Z1 pistons as I don't have the specs on them and know that they are different.
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06-10-2003, 05:29 PM
#10
Solbros Owns Me
Re: Higher Compression (eg cookiemonster)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eg cookiemonster »</TD></TR><TR><TD CLASS="quote">ask emika (i think thats his SN)....hes like the king of single cams</TD></TR></TABLE>
I wouldn't say king...I just like to try everything...lol.
I always say that you gain about 10whp for every 1 point in compression increase. Going from 9.6 to 11.1 is 1.5 compression points, so about 15 hp increase.
But with this added compression, you can take advantage with that with a cam, header, tuning, etc. It just allows all you other upgrades to be worth that much more.
The D16A6 or PM6 pistons have about -3cc's displacement to them, which won't be 11 to 1, so I would say stick with those B7's like what Spade said.
Stay OEM...much cheaper
I wouldn't say king...I just like to try everything...lol.
I always say that you gain about 10whp for every 1 point in compression increase. Going from 9.6 to 11.1 is 1.5 compression points, so about 15 hp increase.
But with this added compression, you can take advantage with that with a cam, header, tuning, etc. It just allows all you other upgrades to be worth that much more.
The D16A6 or PM6 pistons have about -3cc's displacement to them, which won't be 11 to 1, so I would say stick with those B7's like what Spade said.
Stay OEM...much cheaper
06-10-2003, 10:53 PM
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Re: Higher Compression (Emerika)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Emerika »</TD></TR><TR><TD CLASS="quote">
The D16A6 or PM6 pistons have about -3cc's displacement to them, which won't be 11 to 1, so I would say stick with those B7's like what Spade said.
Stay OEM...much cheaper </TD></TR></TABLE>
Your brother said a6's would give me 11:1 in my build with the z6 head milled .020. I confirmed that with a compression calc, so it seems like the a6's with a y8 head would have higher than 11:1.....
The D16A6 or PM6 pistons have about -3cc's displacement to them, which won't be 11 to 1, so I would say stick with those B7's like what Spade said.
Stay OEM...much cheaper
</TD></TR></TABLE>Your brother said a6's would give me 11:1 in my build with the z6 head milled .020. I confirmed that with a compression calc, so it seems like the a6's with a y8 head would have higher than 11:1.....
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