Does anyone have a RV8 3.5 with Weber 500 carb on?
Discussion
I've just fitted one to my Morris hot rod (nope, not a kit car, sorry, but built from a pile of bits all the same) and it is overjetted. I've also fitted a Performer manifold, as the carb didn't want to mate to the Offy 360 I already had. Does anyone have a stock motored car that has a well-running Weber 500 on and they can give me their jet and metering rod sizes to save me a load of faffing about?
I bought a recommended size jet set from RPI engineering, but it still fluffs a bit off idle and doesn't seem quite as awe inspiring as I was thinking/hoping £400 worth of carb and manifold would make it.
It is definitly an improvement over the old and tired Weber 38dgas I had on before, but I was hoping for more.
I bought a recommended size jet set from RPI engineering, but it still fluffs a bit off idle and doesn't seem quite as awe inspiring as I was thinking/hoping £400 worth of carb and manifold would make it.
It is definitly an improvement over the old and tired Weber 38dgas I had on before, but I was hoping for more.
King Herald
I have Webber 500 Carb on an Offenhauser dual plane manifold on my Dax Rush (super 7) RV8. Was on my original 3.5ltr motor , and then was put on to my new 4.6ltr motor which V8 Developments (Spalding, Lincs) built up for me. I had flat spots and fluffs too , until V8 Developments rejetted and correctly adjusted the carb. Now it is spot on , and 300BHP in 660kgs is FUNNNN !!!
Ray Webb, who owns and runs V* Developments is both extremely knowledgable, and passionate, about the rover V8 in all its incarnations, so they should be able to help you out ---> www.v8developments.co.uk/
I have Webber 500 Carb on an Offenhauser dual plane manifold on my Dax Rush (super 7) RV8. Was on my original 3.5ltr motor , and then was put on to my new 4.6ltr motor which V8 Developments (Spalding, Lincs) built up for me. I had flat spots and fluffs too , until V8 Developments rejetted and correctly adjusted the carb. Now it is spot on , and 300BHP in 660kgs is FUNNNN !!!
Ray Webb, who owns and runs V* Developments is both extremely knowledgable, and passionate, about the rover V8 in all its incarnations, so they should be able to help you out ---> www.v8developments.co.uk/
rushv8 said:
King Herald
I have Webber 500 Carb on an Offenhauser dual plane manifold on my Dax Rush (super 7) RV8. Was on my original 3.5ltr motor , and then was put on to my new 4.6ltr motor which V8 Developments (Spalding, Lincs) built up for me. I had flat spots and fluffs too , until V8 Developments rejetted and correctly adjusted the carb. Now it is spot on , and 300BHP in 660kgs is FUNNNN !!!
Ray Webb, who owns and runs V* Developments is both extremely knowledgable, and passionate, about the rover V8 in all its incarnations, so they should be able to help you out ---> www.v8developments.co.uk/
I have Webber 500 Carb on an Offenhauser dual plane manifold on my Dax Rush (super 7) RV8. Was on my original 3.5ltr motor , and then was put on to my new 4.6ltr motor which V8 Developments (Spalding, Lincs) built up for me. I had flat spots and fluffs too , until V8 Developments rejetted and correctly adjusted the carb. Now it is spot on , and 300BHP in 660kgs is FUNNNN !!!
Ray Webb, who owns and runs V* Developments is both extremely knowledgable, and passionate, about the rover V8 in all its incarnations, so they should be able to help you out ---> www.v8developments.co.uk/
Thanks for the info, I'll get in touch with Ray sometime soon (I'm on a ship in the USA as we speak, but I live in the Midlands) and see what he would say about a dyno session or maybe even just some jetting suggestions. There are so many combinations of jets, metering rods and springs available, I could guess at it for years and still miss out on the real performance available.
pearl nicholas said:
a mate of mine was advised that 6252 rods and 1421 jets were the correct set up for his 3.5 with an offy
I have the 6252 metering rods, from RPI, but the primary jets are 0.080" and I'm not sure if they have a part number, but they are the ones RPI recommended too.
It might be just right as it is, 'as good as it gets', but it doesn't feel quite right off idle. Dyno time is the next step methinks.
1421 rods are 80 thou so i would think you are on the right track,ive tried fiddling with his and its all just guesswork, as you state its best to get it to a rolling road to optimise it,may be best for you to get a calibration kit which also has the different step up springs for the rods which may cure the stumble
Edited by pearl nicholas on Sunday 17th December 21:24
pearl nicholas said:
1421 rods are 80 thou so i would think you are on the right track,ive tried fiddling with his and its all just guesswork, as you state its best to get it to a rolling road to optimise it,may be best for you to get a calibration kit which also has the different step up springs for the rods which may cure the stumble.
Mine was hopelessly overfuelled when I first stuck it on, sooty black plugs, hard starting etc. Five minutes on the phone to RPI and £18 of jets and metering rods and it was somewhere near. He (forget his name) also told me to move the accelerator pump connection right to the last hole, to minimise the fuel shot.
I'd like to have a go at the 'dyno meet' they are planning on the P&P page, but I won't be able to get there.
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