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Hello everyone,
I mount on my set up new GIANNELLI FIRE yesterday. Till now I have SITO PLUS exhaust and top speed was around
60 km/h.– DR EVO 43 with port matching
– dellorto 13/13 + malossi air filter, widen carb intake
– 90 mm vario with malossi contra yellow spring
– electronic ignition
– 9 g roller weights
– main jet 66 ( with SITO PLUS 64)With new expansion exhaust and a litlle bigger main jet 66 (before 64)is top speed now 55 km/h. Where do I was making mistake. What could be a problem.:?
Thanks in advance!
9gr roller weights are a bit on the heavy side for the Gianelli fire. Gianelli fire have more power in a higher RPM band than the Sito Plus.
Try 6 to 8gram roller weights (if you can, mix them to finetune it).
Hello,
At home I have complete of 6 g, 7g and 9 g roller weights sets. Do you suggested me that I maybe mix 3×7 g and 3x9g or ??
Yeah you could start with mixing 6g with 7g. make sure to spread them evenly. first a 6g roller, then a 7g roller.
This would make a 6.5g average roller.Problably a little bit too light, since the Gianelli Fire isn’t a highRPM exhaust, but definitely a higher RPM exhaust than the Sito.
Niek1992 thanks for the suggestions.
Is it wise that you mix the 6g and 9g or 7g and 9g roller weights?Anyone else have maybe another opinion.
regards
i personally think you should go lower with the weights. Friend drives a Polini speedengine with DR43evo, exhaust is a Gianelli original power, and he runs with ~6.5g rollers.
if i were you i would get my hands on one of those ”adjusting rollersets” (clickable). that way you can pinpoint the best rollers for your specific engine.
I have exactly the same setup.
My topspeed was 79 with main jet 70, gianelli fire, malossi vario and 7 grams roller weights. 😉Today I have installed 6x 7g roller weights. Top speed is raising to 61 km/h. Should I go little bit down, maybe 3x 6g and 3x 7g?
yeah you could. If you keep your eye on your variator while accelerating, you can see if it’s variating too fast, and thus not reaching topspeed.
Do you mean by this if the roller weights are too light it variates too fast and vice versa too slow with heavier rolls?
:con
I think this is wat niek1992 ment to say.
If the rolls are very licht, it wil not variate.:no and not reach topspeed.
If the rolls are to havy, it wil variate to soon.:noSo if you have a tuned setup that has its top power at say 9000 rpm, you need lighter rols than for a standaard setup.(y)
A set up whit a lot of power wil need a stronger spring in the cluch. en thus may need heavier rolls.:!
but the principle stays the same.:pJust wondering, which gears are you using .. 1:11,5?
Sorry for may late response, I have 1:12.5 gearing. Yesterday I was also put mixed 3x6g and 3x7g rolls (average 6,5 g) but the top speed remains around 60 KM/h (GPS) only the acceleration is maybe a little bit better. I assumed that with my gearing (1:12.5)I’ve already reach the limit:(
Do you think I must looking for gearing MALOSSI 1:9 or CIF 1:9.5? What about some bad experiences with CIF gearing?
regards
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