Discussion
found this site -- dedicated to the bmw 8 series, but this page has nice pictures and explainations of different engine configs. stumbled upon it when looking for technical information of what a flat-plane crank is to explain it to a friend.
www.e31.net/navmisc_e.html
www.e31.net/navmisc_e.html
byker28i said:
Interesting but is this right?
[I]Because of the crankshaft, the sound of such an engine is the one of two four cylinder engines. A (typical american) cross-plane burbling cannot be achieved.[/I]
The AJP8 makes a great noise...
[I]Because of the crankshaft, the sound of such an engine is the one of two four cylinder engines. A (typical american) cross-plane burbling cannot be achieved.[/I]
The AJP8 makes a great noise...
Edited by byker28i on Friday 2nd February 15:34
Yup that's right the flatplane crank has the noise of two four pots chuffing away and not the rumbling you get from the likes of the Chevy, Ford Cobra Mustang etc. It does sound great but then so does the Fezza 360/430 etc. that is also flatplane they tend to have a higher pitch to the noise
Thats also why, when you set the engine up, that it is important to get the banks balanced, because what you are trying to do is to get 2 four cylinder engines to not only work at peak efficiency, but also to have them equally balanced.
The cross plane V8's (i.e the classic yank V8) also needs a big heavy flywheel which is why thay are a slower reving engine.
The flat plane crank is very free revving, it gives instant revs, and when you take your foot of the gas pedal it almost instantly drops to a tick over, and the cross plane yank V8's are slow to drop to an idle speed because they have a lot of latent inertia in that heavy flywheel.
Bleedin hell, latent Ineria ! - did I really say that ? It almost sounds like I know what I'm talking about :-)
The cross plane V8's (i.e the classic yank V8) also needs a big heavy flywheel which is why thay are a slower reving engine.
The flat plane crank is very free revving, it gives instant revs, and when you take your foot of the gas pedal it almost instantly drops to a tick over, and the cross plane yank V8's are slow to drop to an idle speed because they have a lot of latent inertia in that heavy flywheel.
Bleedin hell, latent Ineria ! - did I really say that ? It almost sounds like I know what I'm talking about :-)
jensena said:
The flat plane crank is very free revving, it gives instant revs, and when you take your foot of the gas pedal it almost instantly drops to a tick over, and the cross plane yank V8's are slow to drop to an idle speed because they have a lot of latent inertia in that heavy flywheel.
Tell me about it - I hit the rev limiter last week for the first time (sorry Alan) - what the heck is a big V8 doing reving that far
For the record it was in second as I out accelerated a Clio sport who wanted to play...
byker28i said:
Tell me about it - I hit the rev limiter last week for the first time (sorry Alan) - what the heck is a big V8 doing reving that far
For the record it was in second as I was out accelerated a Clio sport who wanted to play...
I'm assuming you hit the limiter and lost out to the Clio because you were stationery and the wheels were smoking
Edited by HarryW on Friday 2nd February 22:43
I wasn't playing but had ACDC playing on the sound system. I must have been playing along with the throttle at the lights as this Clio sport just launched it.
Well - it would have been rude not to respond.
I let him stay ahead until the vodaphone roundabout (newbury) then as it's all nicely laid with that grippy tarmac I booted it - and waved as I went past
Well - it would have been rude not to respond.
I let him stay ahead until the vodaphone roundabout (newbury) then as it's all nicely laid with that grippy tarmac I booted it - and waved as I went past
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