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Author Topic: which head is better pm3 or pm8  (Read 5372 times)

turboblack2door

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which head is better pm3 or pm8
« on: September 13, 2009, 11:26:31 AM »
I am swapping motors in my dd beater. I have a d15b7(pm8) and a d15b2(pm3) the b2 has bad valves and a good bottom end and the b7 has a good head and a broken piston. Which would be best for my to4e 50trim dd?
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chris

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Re: which head is better pm3 or pm8
« Reply #1 on: September 13, 2009, 03:42:25 PM »
same head
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ryan89crx

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Re: which head is better pm3 or pm8
« Reply #2 on: September 13, 2009, 04:21:21 PM »
same head, different cam/springs
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turbob16hatch

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Re: which head is better pm3 or pm8
« Reply #3 on: September 13, 2009, 06:09:26 PM »
Quote from: ryan89crx on September 13, 2009, 04:21:21 PM
same head, different cam/springs

Would you happen to know the details on the difference between the two?
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Joseph Davis

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Re: which head is better pm3 or pm8
« Reply #4 on: September 13, 2009, 07:29:03 PM »
One sucks, the other sucks hard.
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crttaz

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Re: which head is better pm3 or pm8
« Reply #5 on: September 13, 2009, 08:53:45 PM »
Quote from: turbob16hatch on September 13, 2009, 06:09:26 PM
Quote from: ryan89crx on September 13, 2009, 04:21:21 PM
same head, different cam/springs

Would you happen to know the details on the difference between the two?

One the cams, yes I know. I believe I measured the B1 cam, but it sucks.  B2 and B7 cams are the same.
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SDRAWKCAB

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Re: which head is better pm3 or pm8
« Reply #6 on: September 13, 2009, 08:57:41 PM »
b7 has better springs.
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Joseph Davis

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Re: which head is better pm3 or pm8
« Reply #7 on: September 13, 2009, 08:58:19 PM »
You laid hands on a B2 with a B7 cam swapped in, then.  I went from a B2 with B7 IM and P06 to an actual B7, with the same exhaust manifold/exhaust/etc.  There's a difference in top end.
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crttaz

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Re: which head is better pm3 or pm8
« Reply #8 on: September 13, 2009, 09:17:31 PM »
Quote from: Joseph Davis on September 13, 2009, 08:58:19 PM
You laid hands on a B2 with a B7 cam swapped in, then.  I went from a B2 with B7 IM and P06 to an actual B7, with the same exhaust manifold/exhaust/etc.  There's a difference in top end.

Nope, it was a B2 OEM cam, I still have it. 90 DX motor got sludged, supplied no oil to the cam and it seized. The car was serviced by local Honda and the head was replaced. I got the old B2 head. Still have the cam and head.

Made a great fixture.




About the B7 springs being better.....depends on when Honda changed oevr to use up old stock. 1992 and early 1993 production used D15 springs, but at some point in 1993 Honda started using D16A6 springs which are slightly stiffer.
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turboblack2door

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Re: which head is better pm3 or pm8
« Reply #9 on: September 14, 2009, 07:56:33 AM »
Quote
About the B7 springs being better.....depends on when Honda changed oevr to use up old stock. 1992 and early 1993 production used D15 springs, but at some point in 1993 Honda started using D16A6 springs which are slightly stiffer.
by looking at the head is there anyway to tell what springs? Also my b7head has threaded where the vtec solenoid   would bolt to like my a6 and the b2 doesnt
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chris

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Re: which head is better pm3 or pm8
« Reply #10 on: September 14, 2009, 03:22:48 PM »
Quote from: turboblack2door on September 14, 2009, 07:56:33 AM
Quote
About the B7 springs being better.....depends on when Honda changed oevr to use up old stock. 1992 and early 1993 production used D15 springs, but at some point in 1993 Honda started using D16A6 springs which are slightly stiffer.
by looking at the head is there anyway to tell what springs? Also my b7head has threaded where the vtec solenoid   would bolt to like my a6 and the b2 doesnt



The d16a6 are painted type r red
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crttaz

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Re: which head is better pm3 or pm8
« Reply #11 on: September 14, 2009, 03:36:21 PM »
Quote from: turboblack2door on September 14, 2009, 07:56:33 AM
Quote
About the B7 springs being better.....depends on when Honda changed oevr to use up old stock. 1992 and early 1993 production used D15 springs, but at some point in 1993 Honda started using D16A6 springs which are slightly stiffer.
by looking at the head is there anyway to tell what springs? Also my b7head has threaded where the vtec solenoid   would bolt to like my a6 and the b2 doesnt

That is for the fuel pump, not VTEC.

:duncecap:
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turboblack2door

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Re: which head is better pm3 or pm8
« Reply #12 on: September 14, 2009, 03:50:53 PM »
ok but its in the same place where the vtec solenoid goes
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brine04

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Re: which head is better pm3 or pm8
« Reply #13 on: September 14, 2009, 04:56:07 PM »
Quote from: turboblack2door on September 14, 2009, 03:50:53 PM
ok but its in the same place where the vtec solenoid goes
In jdm land some have carbs and mechanical fuel pumps that run off the cam.
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chris

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Re: which head is better pm3 or pm8
« Reply #14 on: September 14, 2009, 05:11:10 PM »
Quote from: turboblack2door on September 14, 2009, 03:50:53 PM
ok but its in the same place where the vtec solenoid goes


put one there then sir.
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