Does Changing Firing Order make more Power?

[dmcclanahan]

I know most chevy V8s its 1-8-4-3-6-5-7-2, but would it give it more power then the firing order of say 1-2-3-4-5-6-7-8?

[INSIDIOUS '86]

The engine couldn't run like that. The only thing you can do is a 4-7 swap with a 4-7 swap cam
Posted via Mobile Device

[Dalaigh]

no, and running it at 1-2-3-4-5-6-7-8 would distroy your engine. It would vibrate like an old tractor. The firing order is designed to limit the engines vibrations, and the cam shaft is designed to run 1-8-4-3-6-5-7-2.

[camshaftgsxr]

the 4/7 swap is to make it smoother, it is what the ls engines run on (i think)

[franky69c10]

Originally Posted by camshaftgsxr

the 4/7 swap is to make it smoother, it is what the ls engines run on (i think)

How would that work on TBI engines
Posted via Mobile Device

[grs]

I don't think it would even run.

[babyJay]

It won't run long if it even starts. Impossible, I believe. I've never heard of it being done.

[grs]

Originally Posted by babyJay

It won't run long if it even starts. Impossible, I believe. I've never heard of it being done.

I did drive a VW into the VW garage when I was a VW mechanic in 1969. It was only hitting on one cyl. That surprised the shop foreman. He rechecked it, and I was right.

[406 Q-ship]

Originally Posted by camshaftgsxr

the 4/7 swap is to make it smoother, it is what the ls engines run on (i think)

The 4/7 swap does not make the engine smoother, that was done by racers to get rid of the 5 and 7 firing so close together. Does not work because then 4 and 2 are now sequential.

The LS is a 4-3/7-2 swap to make the engine run smother. LS firing order is 1-8-7-2-6-5-4-3. This is the one racers should do to get the cylinders to not fire sequential. If you renumber a Ford 351 (or all later Ford V8s) cylinders to the same way GM does it, you will see that the firing order is the same (so Ford got it right....ouch that hurts to say).

1-8-4-3-6-5-7-2 STD most V8's
1-8-7-3-6-5-4-2 Swaped 4 and 7
1-8-7-2-6-5-4-3 LS V8s

[Corts60]

I agree with all above, swapping the firing order around will either get you nothing or a lot of trouble. Do not do it. Camshafts and crankshafts are made for a specific firing order and if a spark comes along when a cylinder isn't expecting it....trouble.

[Evil Trailblazer SS]

edited by staff.

[one low c10]

the 4-7 swap only makes more hp in high rpms

[85Bowtie]

Originally Posted by Evil Trailblazer SS

edited by staff

I see how it is....this is an acceptable response but mine get's me a "warning" from one of the mods....must have to be one of the boys on here or something...

A stupid question deserves a stupid response.

[Liz]

if you see an issue use the report a post feature... please check the attitude while you are away

[Evil Trailblazer SS]

Originally Posted by 85Bowtie

I see how it is....this is an acceptable response but mine get's me a "warning" from one of the mods....must have to be one of the boys on here or something...

A stupid question deserves a stupid response.

I'm right there with you, but I knew going in that my post would likely not stay up. Instead of teaching members to use a little common sense before asking such ridiculous questions, we apparently have to play the role of teacher and help them to understand that what they said was far beyond stupid. Or we just have to keep letting them make fools out of themselves for fear of hurting their feelings.
Posted via Mobile Device

[oldschool18]

Not everyone grew up around cars and trucks and some people dont have good mechanical skills, and yes sometimes you should google your Q? before you post it. I grew up in a my fathers garage he's been in business for over 40 years but i'm not a mechanic, he can tare a car apart and put it back together like nothing but he couldnt build a wooden shelf if he had to. give a guy a break if you think its a stupid Q? go to a differant thread. thats just my 2 cents

[Evil Trailblazer SS]

Anyone who doesn't understand the concept of a firing order and it's effects on the symphony of various moving parts and the general harmonics of an engine should not be considering such radical changes. Dumb is dumb no matter how you slice it...I'm sorry, but that is the truth.
Posted via Mobile Device

[54Caddy]

Originally Posted by 406 Q-ship

The 4/7 swap does not make the engine smoother, that was done by racers to get rid of the 5 and 7 firing so close together. Does not work because then 4 and 2 are now sequential.

The LS is a 4-3/7-2 swap to make the engine run smother. LS firing order is 1-8-7-2-6-5-4-3. This is the one racers should do to get the cylinders to not fire sequential. If you renumber a Ford 351 (or all later Ford V8s) cylinders to the same way GM does it, you will see that the firing order is the same (so Ford got it right....ouch that hurts to say).

1-8-4-3-6-5-7-2 STD most V8's
1-8-7-3-6-5-4-2 Swaped 4 and 7
1-8-7-2-6-5-4-3 LS V8s

Ford did not get it right, Ford does not use the same cylinder relation as chevy does as far as the left bank being 1 3 5 7 and right bank being 2 4 6 8. Ford is left bank 5 6 7 8 right bank 1 2 3 4. so if you draw a diagram with the two number for the firing order they will not match not even close. GM is totally different than the Ford block. So there is no relation at all between the two

[Josh]

Originally Posted by Evil Trailblazer SS

I'm right there with you, but I knew going in that my post would likely not stay up. Instead of teaching members to use a little common sense before asking such ridiculous questions, we apparently have to play the role of teacher and help them to understand that what they said was far beyond stupid. Or we just have to keep letting them make fools out of themselves for fear of hurting their feelings.
Posted via Mobile Device

Originally Posted by Evil Trailblazer SS

Anyone who doesn't understand the concept of a firing order and it's effects on the symphony of various moving parts and the general harmonics of an engine should not be considering such radical changes. Dumb is dumb no matter how you slice it...I'm sorry, but that is the truth.
Posted via Mobile Device

All questions deserve an answer that is why we are a community. Belittling someone and acting like a superior fool is not beneficial to the community and is not acceptable. If you wanna act that way take it somewhere that is less inviting or friendly. That is the "truth" of how we do things around here.

[oldschool18]

well I was always told if you dont know.....ASK.

[Corts60]

Originally Posted by dmcclanahan

I know most chevy V8s its 1-8-4-3-6-5-7-2, but would it give it more power then the firing order of say 1-2-3-4-5-6-7-8?

Don't worry about some people on this thread. You were right to ask this question to us. That is what we are here for. Good on ya for asking about it before you actually did it though.

[irishman999]

I think this is an awesome venture into automotive tuning no one has ever considered, not engineers or manufactures that built these cars. just try switching all the plug wires around and take note of the results.

[SCOTI]

I don't see anything wrong w/the original question. A guy should be able to reach out & ask his peers a question w/o being ridiculed. I didn't know about the 4/7 cam swap tech stuff until I learned about it (years ago). You gotta' learn somehow. I never wondered if GM's sbc/bbc firing order could possibly be 'better' but apparently the OP was thinking more outside the box than me & did question it. Kudos to him.

It can be frustrating when a guy asks a question over & over getting different responses yet he keeps asking until someone tells him what he wanted to hear all along even though other answers were better/correct.

I always try to research info before asking something that I might think to myself "WTF was I thinking when I asked" type questions . If you knew my friends, you'd always look over your shoulder too .

[joe231]

Originally Posted by SCOTI

If you knew my friends, you'd always look over your shoulder too .

Now I want to meet your friends!!
Posted via Mobile Device

[54Caddy]

Heres a diagram i made for you guys too see the differences between the original sbc, the 4-7 cam swap, and the 4-7 3-2 cam swap, comp cams makes a cam i believe with the 4-7 3-2 cam swap for a standard sbc.