Strength of AJP
Discussion
How strong is the AJP V8? (and out of curiosity is the 4.2 any different from the 4.5?)
Dealer said the engine was a massively strong engine. Im aware of mild wasp-like buzzing pang of concern somewhere in the back of my head when I push the car hard, given that it revs a lot higher than the Rover V8, dont want to damage it kinda feeling.
Where should the redline be on a 4.5. Ive either been hanging on for dear life, or had windows wide open (never shut them, not even in the snow tonight
and havnt yet heard the changeup beep/light, so am not sure where it is.
Dealer said the engine was a massively strong engine. Im aware of mild wasp-like buzzing pang of concern somewhere in the back of my head when I push the car hard, given that it revs a lot higher than the Rover V8, dont want to damage it kinda feeling.
Where should the redline be on a 4.5. Ive either been hanging on for dear life, or had windows wide open (never shut them, not even in the snow tonight
and havnt yet heard the changeup beep/light, so am not sure where it is.
It won't kill it, but it might wear it out a bit more... but so what? It's a sports car Just make sure it's warmed up nicely before revving to avoid most of the wear.
I think the revlimiter is around 7500. The engine is strong, as in it doesn't often throw rods out the side. It's more likely to wear out. The most likely thing to blow it up is over revving on a down change I imagine.
Just make sure it's warmed up nicely before revving to avoid most of the wear. I think the revlimiter is around 7500. The engine is strong, as in it doesn't often throw rods out the side. It's more likely to wear out. The most likely thing to blow it up is over revving on a down change I imagine.
Tam Lin said:
though God only knows what that is in actual crank speed...
Off the top of my head:
v=Wr where v = linear velocity, W (omega) = radial speed and r = radius
W = 7,250rpm = 759.2 radians/second (multiply by 2pi and divide by 60)
From Google the stroke of a 4.5 is 86mm which means r = 43mm = 0.043m
So v = 759.2 x 0.043 = 32.6 meters/second (or 1.216mph in real money)
.... although I could be wrong
I think the buzzer used to go off around 7000 or so in mine. Never looked in to see the light as I was normaly arriving at the braking zone on a sprint circuit at that point looking like this 
I can vouch that my 4.2 V8 isn't that strong, admitadely its a 1996 but its only done 40k.
Head bolt went the other week when not pushing the engine at all, I've never dared go anywhere near 7000rpm.
TVR said they've seen them go before but they want to rebuild the engine to a certain point just incase there is anything major wrong with it. And if there is then I'll have a 4.5 instead because they don't have the old parts anymore!
Anyone else seen this before?
Head bolt went the other week when not pushing the engine at all, I've never dared go anywhere near 7000rpm.
TVR said they've seen them go before but they want to rebuild the engine to a certain point just incase there is anything major wrong with it. And if there is then I'll have a 4.5 instead because they don't have the old parts anymore!
Anyone else seen this before?
grahamdance said:
Off the top of my head:
v=Wr where v = linear velocity, W (omega) = radial speed and r = radius
W = 7,250rpm = 759.2 radians/second (multiply by 2pi and divide by 60)
From Google the stroke of a 4.5 is 86mm which means r = 43mm = 0.043m
So v = 759.2 x 0.043 = 32.6 meters/second (or 1.216mph in real money)
.... although I could be wrong
It's 72.9241 mph. Looks like factor of 60 got lost somewhere.
I can't imagine a crank moving at 1mph is going to break anything much, unless it's on a steam roller.
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