angel
Enthusiast
- Messages
- 2,449
- Location
- Athens, Greece
A friend of mine with a 1975 French-spec R4 (still with the 782cc engine and 26 DIS-5 carb) asked me about what can be done to increase performance. He, being used to modern cars, feels that the bottom-to middle rpm torque is low.
Although the engine runs great (and is in good shape), it feels underpowered, similar to my '71 with average-condition engine. The solution would be to go to a bigger carb. I was thinking of 32 mm combined with the later vacuum advance distributors, which, from my experience, works wonders on the 845cc engine.
Has anyone tried this on the 782cc engine? I'm between two thoughts: One, that 32mm throttle bore would be too much for the small engine, and the other that, since both 845cc and 782cc engines share the same camshaft and head, why should a 32 mm carb not perform equally well on the 782?
One fact puzzled me more. In the mid -70s Renault changed the camshaft timing (on the 845cc engine) and made it hotter, while keeping the carb down to 28mm. Then in 1984, they returned to the initial camshaft timing, enlarging the carburettor to 32mm and altering the ignition curve (I think a bigger carb would suit better the hot camshaft)...
So I'm waiting to hear your comments/experience...
Although the engine runs great (and is in good shape), it feels underpowered, similar to my '71 with average-condition engine. The solution would be to go to a bigger carb. I was thinking of 32 mm combined with the later vacuum advance distributors, which, from my experience, works wonders on the 845cc engine.
Has anyone tried this on the 782cc engine? I'm between two thoughts: One, that 32mm throttle bore would be too much for the small engine, and the other that, since both 845cc and 782cc engines share the same camshaft and head, why should a 32 mm carb not perform equally well on the 782?
One fact puzzled me more. In the mid -70s Renault changed the camshaft timing (on the 845cc engine) and made it hotter, while keeping the carb down to 28mm. Then in 1984, they returned to the initial camshaft timing, enlarging the carburettor to 32mm and altering the ignition curve (I think a bigger carb would suit better the hot camshaft)...
So I'm waiting to hear your comments/experience...