4.6 RV8 Not Suitable For a Manual Gearbox
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4.6 RV8 Not Suitable For a Manual Gearbox
I was speaking to a guy tonight about putting a RV8 4.6 in my Landrover FC101 as a replacement for the 3.5. He has a 5.1 RV8 in his 101.
He said that the 4.6 was never designed to go in front of a manual gearbox and as such the thrust bearing in the centre of 4.6 crankshaft had thinner thrust faces as the shocks in running an auto were less that that of a manual with heavy clutch changes. As a result the amount that the crank can move forward and back is excessive for manual use and before long the crank movement will be out of tolerances.
I have not heard this issue before so am just curious if anyone else has heard this and if it is correct what is the solution - eg what thrust bearing will correct this?
Cheers
Garry
He said that the 4.6 was never designed to go in front of a manual gearbox and as such the thrust bearing in the centre of 4.6 crankshaft had thinner thrust faces as the shocks in running an auto were less that that of a manual with heavy clutch changes. As a result the amount that the crank can move forward and back is excessive for manual use and before long the crank movement will be out of tolerances.
I have not heard this issue before so am just curious if anyone else has heard this and if it is correct what is the solution - eg what thrust bearing will correct this?
Cheers
Garry
My 4.6 is on a 2wd manual box in my car 👍
Regards Tony C (COOPS)
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts.
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts.
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
Good point. The 4.6/4.0 and some late 3.9's have a thrust bearing attached to just the upper main bearing shell. Earlier engines had a thrust bearing attached to both the upper and lower bearing. This gave twice as much thrust area and longer wear resistance. However unless you are a clutch pedal rider I can't see that the later spec will have a problem. Better oils /materials must help also.ChrisJC wrote:As far as I know, the only difference between the cranks on a 4.0 and 4.6 is the throw. And the 4.0 engine was most definitely fitted to manual vehicles.
Chris.
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Thanks for the responses - so I take it that no one has heard of this.
Unfortunately evidence that people have a 4.6 in front of a manual is no real evidence as the end play issue does not become evident until higher kms have accumulated. There are no issues with a new or low km engine.
Cheers - I will chalk it down to rumour.
Garry
Unfortunately evidence that people have a 4.6 in front of a manual is no real evidence as the end play issue does not become evident until higher kms have accumulated. There are no issues with a new or low km engine.
Cheers - I will chalk it down to rumour.
Garry
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Well look at it another way.
Have these people show proof of engines that suffered a problem through using a manual transmission.
I suspect they wont be able to. Not all engines have full 360 thrusts.
MGRV8 used a manual trans with a 4.0 as did some TVR's, Some TVR's also use the 4.6 and are all manual.
And I'm sure there are some Land Rovers out there, Discoverys if not RR's that used a manual trans with either of the engines.
Really...there are far more things to worry about than that
Have these people show proof of engines that suffered a problem through using a manual transmission.
I suspect they wont be able to. Not all engines have full 360 thrusts.
MGRV8 used a manual trans with a 4.0 as did some TVR's, Some TVR's also use the 4.6 and are all manual.
And I'm sure there are some Land Rovers out there, Discoverys if not RR's that used a manual trans with either of the engines.
Really...there are far more things to worry about than that
8yrs I've been abusing my 4. 6 on a manual box 👍😉😂
Regards Tony C (COOPS)
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts.
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts.
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
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