Cool video I found.

[seagreen323i]

Some absolute mad man has built a m60b44 hybrid with a jag blower, put it in a fricken T bucket. Then converted the firing order to a big bang setup.

https://youtu.be/ehZuhfOv3so

What a legand.

Sent from my SM-G973U using Tapatalk

[JimLev]

He’s got a build thread here that I’ve been following.

[seagreen323i]

I saw his original build thread. The whole firing order thing is really cool and just saw that today.

Sent from my SM-G973U using Tapatalk

[Mykk]

Glad you like my project :-)

[seagreen323i]

Glad you like my project :-)Hey I know that guy. Probably the most intresting thing I've seen in a long long time. Didn't really know that was a thing you could do without custom grind cams or something. Seeing as its a dohc it makes sense just to flip the timing on one bank.

Sent from my SM-G973U using Tapatalk

[ross1]

Not a fan of mixed genres or change for the sake of change. I'm guessing the crank doesn't like this modification.

[JimLev]

Not a fan of mixed genres or change for the sake of change. I'm guessing the crank doesn't like this modification.


Not a fan of experimentation? What if that netted him an additional 25-35HP in the process without any additional cost. Beats all the thousands Dinan charges for gains you need a dyno to measure.

[Sleepyhead97]

Not a fan of mixed genres or change for the sake of change. I'm guessing the crank doesn't like this modification.

:rofl

Quiet old man! Lol. Let the kids play

[ross1]

Not a fan of experimentation? What if that netted him an additional 25-35HP in the process without any additional cost. Beats all the thousands Dinan charges for gains you need a dyno to measure.

It's not going to gain power, that's predictable.
Some have changed firing order, exchanging 5 & 7 positions, on Chevy V-8s with dubious results.
What this guy has done will certainly mess with crankshaft harmonics. Perhaps the crank is strong enough to survive but there is no upside to doing this.
Neat experiment but a predictable failure if looking for power, smoothness or durability, the intent of any engine.
These engines are pretty well wrung out from the factory. Making any significant improvements with anything aside power adders is going to be difficult and with quickly diminishing returns.
My money says it gets returned to it's original configuration.

[JimLev]

It’s a 4/7 change, just a different cam on a Chebby or Ford.
According to this article the big gain is in the midrange, only 3-4HP at the top end.
It’s a good read if your a gear head.
https://www.hotrod.com/articles/lunati-cams/

[ross1]

Yes, 4 & 7.
Great article. The idea of manifolding and not having 5&7 firing next to each other makes the most sense to me.
I'd be interested to see the results if using individual throttles.

[topaz540i]

I’m going to guess that this car has a massive loss of tractability. With the power delivery being that jerky it’s probably going to constantly chirp the tires

[BMW540san]

Very cool video. I won't get into discussion about firing order but rather point out why M60 engine has pretty much zero TC guides failure rate.
Look around 1 min into video and it shows actual sprocket instead of stupid U guide on M62.
Also, it has Duplex (two rows of chain) vs Simplex (single row of chain) on M62.
Other than well known issue with cylinder bore wear which is not the engine design fault, I'd pick M60 over M62 any time of the day and gladly accept less HP and torque.

[seagreen323i]

I’m going to guess that this car has a massive loss of tractability. With the power delivery being that jerky it’s probably going to constantly chirp the tiresActually quite the opposite. Once a tire loses grip the amount of friction it has exponentially decreases. The ideology behind this (at least for the r1 he refrenced) was to give a slight break in power allowing time for the rear tire to grip back up. So insted of having a smooth firing order and even powerstrokes the slight gap in theory would give the tire a brief moment to find some more grip.

Sent from my SM-G973U using Tapatalk

[Mykk]

I have heard the "Allows tire to grip between pulses" theory, and it seems popular in the motorcycle racing guys. I would like to point out, with the 'Big bang' R1 style firing it has two powerstrokes for every crank rotation. At 700rpm idle, there is roughly 12 crankshaft rotations a second. So, the R1 firing style has 24 power strokes per second at 700rpm idle. At 3000rpm, 100 powerstrokes per second. At 6000RPM, 200 powerstrokes per 1 second....and at the R1's redline of 13,750rpm there is 458 powerstrokes per second! With the gear lash in the trans and other sloppy variables I'm not buying the "Tire grip in between power pulses" thing.

On the flip side of that coin, having two cylinders fire at once will not double the power output. Things in our universe don't work incrementally like that, although I wish they did. But, I would say it's realistic to expect a 20%, maybe even 30% increase in torque. With a trade off somewhere else in the RPM range. But this is just theoretical. If you watched my video through you'd know that this wasn't meant for long term, it was an experiment for fun. For conversations sake...for this conversations sake :-)