kitracer

Nice to hear you like our product
Any questions, feel free to post them here.
I think opening up 1 meter is not good enough so you didnt get the full power from it... just kidding.

kitracer

On that Serpent 1st round, Wai used PR15 to take 2nd place and made the fastest lap at 16.653. of the day.
We were the only 3 cars made over 100 laps within 30 mins. Rest of the field (from 3rd place down) were 3 laps and more behind.

See, I told you, openning up 1 meter is not good enough, you need to do it by 3 laps or more....... of course, if I was racing, I could have done better

MAVICXXX

good for you bro,mine tested on FX failed,it was like too much fuel flowing into the engine at mid and top,initial is ok,change plug and plays wit head shim also did no good.Next me gonna try on JP black and NSR crankcase.
The day is getting closer while i havent got my engine ready for it..

esham

Thanks guys.. I'm in..!!
Ed: No..No..No sleeve modifing..I stop awhile ago remember me Ed the guy that PM you about engine mod 2 years ago.. Yup! that is me. I'm bad in mod better let the expert or buy new engine. The BRB P/L is bare stock - It already too much power for me.
Kitracer : The opening was at the beginning of the straight.. You would'nt know the result at the end of the straight..

Mavicxxx: On that day, earlier after practise round i messed up the tuning by opening the bottom and top much more because it too punchy. At the end i ran it rich with so much smoke. No flameout and easy to restart. Need to fine tune the engine back again. Probably i need to review this thread from start

EdwardN

iTrader: (1)

Hey Mavic. No need to change crankcases-FX is prettu good case out there.
I would sugest to lean motor on the bottom further then you usualy do on other brands-lean it till it start hositating out of the hole then reacing it back about 1/8 turn. Head shimming is about .4mm total shims for 30% Nitro.
As a suggestion-check induction timing-if it is below 62 deg. on closing-then I woud recomend to alter it (62-64 to close ATDC).
Edward

kitracer

approx 0.4mm for 30% nitro

EdwardN

iTrader: (1)

Thanks
Edward

4racer

wow, 242° to 242° closing cranck,
is this not to mutch??
if i shim under .4 mm total headclearence, i have to high temps on glowplug, and that with 16% nitro and when outdor temp goes up to 25°c engine have a bad restart after stalling
i use odonnell odo97t plug fuel with 5% caster and 5 % synth oil
dieter

teammpp

Hi Dieter,

.4mm total head clearance is too low. With the standard head clearance (silver shim) I add a further 0.1mm bronze shim for 16% nitro. This should be 0.6mm total head clearance for the BRB set in Nova Rossi case.

With a Novarossi C6-TGC or C7-TGC glowplug (The cold plugs are C6-TGF or C7-TGF) and Runner Time 16% fuel I never have any problems with restarts. Instant restart as soon as the flywheel hits the starterwheel. I never have to alter the shimming. If it gets really cold I go to a 5 plug and to a 8 if its really hot.

4racer

hi pe,
now i understand nothing more.
for 30 nitro, total headclearence 0,4mm, and with 16% nitro it must be 0,6 mm??
last year i have use novarossi c6tf or c7tf but to mutch problems with bad plugs.
dieter

Surge

iTrader: (2)

The head shims PE is referring too... .3mm silver + .1mm copper = .4mm total shim thickness. PE's head clearance is the distance from the top of the piston to the bottom of the button. The piston doesn't come all the way to the top of the sleeve so there's additional clearance. .4mm shims + .2-.3mm piston clearance (Eduard can confirm) = .6mm total head clearance.

I recommend measure the head clearance with a piece of solder to see distance from piston to button. This helps when the sleeve is higher or lower depending on the crankcase. I normally use .4mm head shims (measured it at .7mm head clearance) for 30% fuel in Texas so the air pressure or elevation might be different here than where PE is since he runs that clearance with less nitro.

EdwardN

iTrader: (1)

How is going Dieter.
Where did you take 242?
Let's say 35 to open ABDC and close at 62 ATDC-total will come out to 207 total induction.
Edward

ICULKN

Well got my new bi metal piston/sleeve/conrod in yesterday can't wait to race this sunday. I hear good things about it time to see what it can do.
Thanks for the tips Surge.


MTX4life
ICULKN

4racer

hi,
i take a caliper to measured, from top sleeve to piston in tdc,
then i take the bottom plate and measure how mitch he goes in the sleeve,
and then i make shimming for headclearence.
when i take a conrod play from max 3/100 and a maximum rear bearing play from 4/100 mm so i get a total headclearence from +/-0.35-0.4 mm.
if i go what you say i must it to a total from 0,6 mm, this is big.

he ed,
i have not read that you mean duration time, i have read that you mean closing time from cranckshaft, an this is 180° + 62° after tdc = 242°, right??

dieter

xtreme888

Hi Ed,

ygpm.....

philip