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  302 or 5.0 HO/351 Firing order?

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Author Topic:   302 or 5.0 HO/351 Firing order?
SundanceKid
Gearhead

Posts: 1274
From: UT
Registered: Feb 2001

posted 01-26-2002 03:39 PM     Click Here to See the Profile for SundanceKid   Click Here to Email SundanceKid     Edit/Delete Message   Reply w/Quote
On a 302 (non EFI) are there any advantages or disadvantages to either fireing order?

How does either effect the wave harmonics of the intake? Vibration in the rotating assembly? Sound or scavenging of the exhaust?

I know a 302 sounds differant from a 5.0! Just wondered if any of you guys could shed some light on why Ford made the change in 85?

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 01-26-2002 04:06 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Long story why they do it in race engines, but FoMoCo did it to eliminate the inherent cross fire problems between 7 and 8 cylinders with the 15426378 firing order.
Most of my NASCAR engine bulider connections tell me that there is a definate advantage to the life of the crankshaft using the 351 firing order. I have gone over to it with our roller bearing camshafts only because that is the only way they make the cores. I never had any bearing or crank problems with the 15426378 firing order. I also notice no differance in the sound.
As far as power, we saw nothing + - with either.

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Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
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cpmaverick
Gearhead

Posts: 1666
From: Santa Clarita, CA
Registered: Jan 2000

posted 01-26-2002 08:23 PM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
Yeah, I have heard that the 1-3 firing is better than the 1-5 because the 1-5 are both on the same end of the crankshaft. Of course there are other firings that occur in sequence at the same crank race but they are not on the very end.

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69maverick
Moderator

Posts: 1502
From: Thomaston,CT.
Registered: Jan 2001

posted 01-29-2002 08:52 AM     Click Here to See the Profile for 69maverick   Click Here to Email 69maverick     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by cpmaverick:
Yeah, I have heard that the 1-3 firing is better than the 1-5 because the 1-5 are both on the same end of the crankshaft. Of course there are other firings that occur in sequence at the same crank race but they are not on the very end.

I found the same thing as you charlie! I already have a 351w Cam for the Mav. It Justs needs to be instaled. My Son ran a 351w cam last year in his 68 Stang and I saw no real difference!! I did think it cleaned up the idle a little bit?

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Jim B. 70 Maverick Grabber clone 302,c4 auto
Weld drag lites,Holley 600,performer intake,comp cam,MSD ignition,2.5 " pipes Still needs paint!!

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