badfluffy
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just a quick one, will the 3.5 carb manifold fit the 3.9 engine?
3.9 on carbs?
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300bhp/ton
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Yes and lots of people use carbs on a 3.9 in this fashion. However twin SU’s is barely adequate for a low CR 3.5 and will likely strangle a 3.9 if you are hoping for good power and performance.
badfluffy
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jag used twin su's for years on their 4.2 engines to good effect, but this is more for looks than performance
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I'm sure there are adapter kits to put a bigger carb/s on the manifold
badfluffy
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well yes a 4 barrel holly would look even better
300bhp/ton
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What size and spec carbs though and what sort of power output?
Plenty of XK engines use triple setups....
And a few used a couple more
300bhp/ton
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Holley 390 or Weber/Edelbrock 500 is a common carb on an RV8. I use the latter on a 3.9
badfluffy
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its going into a 1959 car, more for the right look than power or speed
300bhp/ton
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Well you did ask, not sure why you are then objecting to replies..........
As for looking right. Bollox, there was no such thing as a Rover V8 in 1959, as the engine didn't make it debut in Rover guise until 1967.
badfluffy
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i know there was no rover v8 then but a carb is more in keeping than masses of censers ,injectors and ecus, being done old school
Rangieman123
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Twin HIF44 SU's and their manifold from a Rover SD1 will fit straight onto a 3.9. These carbs are good for over 180 BHP and give good torque and smooth throttle response lower down in revs, especially off roading in a Land/Range Rover. I'd suggest staying away from the Stromberg carbs from a Range Rover.
A four barrel downdraft carb will give more power but it's more work to get one jetted properly.
The Holley 390 was popular back in the day but hard to find now, and many tuners aren't familiar with them.
A four barrel downdraft carb will give more power but it's more work to get one jetted properly.
The Holley 390 was popular back in the day but hard to find now, and many tuners aren't familiar with them.
Rangieman123
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I drove an MGB V8 fitted with a downdraft two barrel Weber from a 3 litre Capri, which was a lovely mod for a lighter road car.
badfluffy
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now thats the answer i need
Dead Badger the 3rd
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I ran a 3.9 on carbs and LPG and it was fine.
Bit awkward tuning it to run on both fuels through the carbs so it was tuned for gas . Never gave any trouble with good power.
I had twin SU.
Henry_b
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Su carbs strangling low comp 3.5's is false quite a few 4.6's breathe through SU's.
Getting the carbs tuned correctly and the timing set up properly works wonders
Getting the carbs tuned correctly and the timing set up properly works wonders
Dead Badger the 3rd
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My 3.9 on carbs was great. I think even better than fuel injectionSu carbs strangling low comp 3.5's is false quite a few 4.6's breathe through SU's.
Getting the carbs tuned correctly and the timing set up properly works wonders
