4.5 + FFF + syvecs
Discussion
It will work, no idea why it wouldn't, the rev limit will have to be set lower than 8K (dependant on piston and conrods used)to be reliable.
Quote from TVR power December 2011.
"RG have spoke to me about suppling a 4.5 bottom end and to be honest the FFF package I'm sure would be the daddy
"
I would put one on mine but not without VVT or it would kill the torque low down.
Quote from TVR power December 2011.
"RG have spoke to me about suppling a 4.5 bottom end and to be honest the FFF package I'm sure would be the daddy
" I would put one on mine but not without VVT or it would kill the torque low down.
I think that would be the reason it wouldn't work - the FFF is such a smooth fast revving thing, that really works well high up the rev range.
The torque isn't that much different between the two engines - the 4.5 does have more, to be sure, but is 10-20 lb/ft worth losing the character of the FFF?
Having said all that, if someone with big enough pockets to play with it and really make it work, it could be amazing.
The torque isn't that much different between the two engines - the 4.5 does have more, to be sure, but is 10-20 lb/ft worth losing the character of the FFF?
Having said all that, if someone with big enough pockets to play with it and really make it work, it could be amazing.
I'm not talking about max figures, there is a massive difference in the torque curve of a 4.5 and a 4.0 FFF the 4.5 would loose that character due to cam overlap low in the rev range without VVT. just look at the two torque curves.
With VVT it would smooth out the curve. I'm not interested in the numbers only how the car drives. A 4.5 with FFF and VVT would be a very nice toy. All the FFF would do is make the engine rev much more freely to the redline.
I would be investing in the Engineering not the numbers if I decide to do it.
With VVT it would smooth out the curve. I'm not interested in the numbers only how the car drives. A 4.5 with FFF and VVT would be a very nice toy. All the FFF would do is make the engine rev much more freely to the redline.
I would be investing in the Engineering not the numbers if I decide to do it.
DAVEY DEE said:
I know one thing you could expect...A ruddy great bill! 
It would cost whatever RG charge for a FFF with full strip down/re-build (which is the same cost as most of the FFFs out there I would imagine), plus the price of a 4.5 kit listed on Powers website. Might even be cheaper than that if RG normally change bottom end bits - you could as for a credit against the 4.5 kit 
And I can't see any technical reason why it can't be done - VVT would be needed, but more important, would be the warranty !
And it's not really about the top end number is it ? It's about 2000 rpm to 7000ish rpm and the driveability imho.
It would be a great project to do but not without risks.
The result could be the best of both solutions or the loss of what makes each engine great.
The FFF relies on high revs to deliver its results while the stroking of the 4.5 that gives it that low down torque advantage is at the expense of revs at the top. So you may find that the toppy cam of the FFF loses a chunk of the 4.5's low down power but the engine can't rev enough to deliver the gains of the head. Or it could be an absolute monster.
RG dropped the idea after possibly issues sourcing the kit and subsequently talking it through with their head designer. I believe they are actually working on going smaller cc at present after the VCT project.
The result could be the best of both solutions or the loss of what makes each engine great.
The FFF relies on high revs to deliver its results while the stroking of the 4.5 that gives it that low down torque advantage is at the expense of revs at the top. So you may find that the toppy cam of the FFF loses a chunk of the 4.5's low down power but the engine can't rev enough to deliver the gains of the head. Or it could be an absolute monster.
RG dropped the idea after possibly issues sourcing the kit and subsequently talking it through with their head designer. I believe they are actually working on going smaller cc at present after the VCT project.
Edited by DonkeyApple on Sunday 28th October 00:25
Humm... Interesting.
Any news on gen 3 FFF and VCT/VVT. When it's available and what the cost is?
I'm going syvecs regardless of what I do - the car is coming out to the US for a while and knock sensing would make me feel much easier as fuel is an uncertainty here.
Is there anything in the top end replaced for 4.5? Cams maybe?
Any news on gen 3 FFF and VCT/VVT. When it's available and what the cost is?
I'm going syvecs regardless of what I do - the car is coming out to the US for a while and knock sensing would make me feel much easier as fuel is an uncertainty here.
Is there anything in the top end replaced for 4.5? Cams maybe?
Ryan Griffiths said:
Would love to see a datalog like Syvecs showed ages ago proving the knock control actually works on the speed six from the New MBE.
Can it actually log fast enough to show it working and actually allow calibrator to define what is knock and what isn't ?
Hope so
Mbe been around a very long time and what your asking is standard procedures to actually allow calibrator to define what is knock and what isn't... After 14 hrs hard testing on my 5ltr with V Power for sure we now know the define of knock, I've actually been testing my sag on the road with 95 octane without any knock or detonation issues, happy days Can it actually log fast enough to show it working and actually allow calibrator to define what is knock and what isn't ?
Hope so
Dom
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