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Old 04-29-2005, 06:12 PM   #1711
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Quote:
Originally posted by 4racer
ed,
you got a email
dieter
Hey Dieter.
You got it man!!!! It works great!!!!
For different conrod ratio will be slightly different tables ( I checked on my timing software), but works perfectly for this particular case. Put it on Fourm, it will help guys to work if they can't get a protractor.
Edward
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Old 04-29-2005, 08:29 PM   #1712
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Quote:
Originally posted by markp27
As I say, if the temp said 110C, I would have not have even questioned the performance, as it is there - just the temp confused the heck out of me.
Just a tought, maybe your temp gun reading is wrong. Have you tried with other temp gun? By the way, How about your fuel mileage?
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Old 04-29-2005, 10:32 PM   #1713
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Daniz - my thoughts exactly - I took my friends temp gun and his read cooler than mine so it is defintately running cool.
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Old 04-30-2005, 08:21 AM   #1714
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If you don't have any fuel milage problem then I think it's fine.
Maybe your engine has built in air conditioner inside
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Old 05-01-2005, 10:25 AM   #1715
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Old 05-01-2005, 05:12 PM   #1716
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Quote:
Originally posted by 4racer
hi mark,
you life in germany?
if i can help you with timing test, witout a practor, send me a pm or mail
dieter
4racer...are you going to post how to read the timing without a protractor? Thanks.
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Old 05-02-2005, 11:00 AM   #1717
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Quote:
Originally posted by JustRace
4racer...are you going to post how to read the timing without a protractor? Thanks.
I think he should. It will be helpfull for everybody.
In fact, ones we will release our motor, we are planing with every motor provide protractor as part of kit.
Edward
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Old 05-03-2005, 12:26 AM   #1718
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Ed
Finally ran your BRB p/s in the NSRS5 case. I'm very impressed with its perfomance and glad I went with your p/s set

Average temp was around 270-280f.

I'm using 30 percent O'donnel fuel, #5 RB turbo plug, HSN 4 3/4 turns out, LSN 2 turns out, stock shim .3mm

Yesterday's air temp was around mid 80's, humidity mid to high, racing at sea level.

At idle, friend also comented, the exhaust has a crackling sound like a top fueler and funny car at idle. Should I shim the head more by .1mm?

Are there changes you would recomend to what I'm already running?

Thanks Roy
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Old 05-03-2005, 12:46 AM   #1719
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Edward,

I tested my JP FX Palmaris with a 0.3mm shim (i.e. 0.5mm head clearence) and with the smaller head and the engine temperature comes up nicely to 100C (212F) which is much better.
I didn't want to push it much further at the moment, as this is the only useable engine I have at the moment and I have two races this week.

The bottom end power is now lower with the 0.3mm shim, but still enough, I think, as I can get the car to drift in a tight corner under power.
I still feel the top end power isn't as good as it could be, but I'm a little concerened about leaning it out more, in case the engine goes too lean and blows the plug.

Looking inside the engine, it looks black, so this should mean the engine is working hard, correct?

My LSN needle was 2 1/4 turns out and my HSN 4 1/4 turns out.

What I found was the when the engine is idling after a run, the temp will remain around about 100C or may increase.

When I come out of the pits, sometimes it flames out - would this suggest that the LSN is too lean? Also coming into the pits, the engine may cut out if I don't blip the throttle - but there is no sign of it being too rich (i.e. after 20 seconds idle, I can hit the throttle and the engine will rev cleanly still).

After starting the engine, I tend to have to blip the throttle a bit to keep the engine for cutting out. If I open the throttle fully and then close it again, I notice that the revs will drop for half a second and then come back up to idle.

How can I tell if my LSN is lean enough?

Cheers, Mark.
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Old 05-03-2005, 02:54 AM   #1720
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Markp27

what is your pressure line length? it play important role for good idling and accelerate, we have similar engine setup to u and we use LSN 2 turn, HSN 4.5 turn, dont be afraid to lean it more cos BRB works great at about 120-130C and plug choice is critical.
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Old 05-03-2005, 03:11 AM   #1721
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Quote:
Originally posted by tl2111
Markp27

what is your pressure line length? it play important role for good idling and accelerate, we have similar engine setup to u and we use LSN 2 turn, HSN 4.5 turn, dont be afraid to lean it more cos BRB works great at about 120-130C and plug choice is critical.
I'm scared!

I'd have to measure it again, but I've been trying out a shorter pressure line - it is approx 12cm.

Cheers, Mark.
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Old 05-03-2005, 03:18 AM   #1722
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Quote:
Originally posted by markp27
I'm scared!

I'd have to measure it again, but I've been trying out a shorter pressure line - it is approx 12cm.

Cheers, Mark.
Mark

what is your JP crank? IMFAR version or EFRA version? it does make some different also what pipe did you use? I find with 16% nitro 7mm hole crank works great on .2mm head shim and above 7.5mm then .3mm or .35mm is the way to go.
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Old 05-03-2005, 03:23 AM   #1723
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1 more things I found that with our BRB is you dont have to worry about the temp cos when its goes lean performance will drop stranght away, rich it performance will come back.
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Old 05-03-2005, 03:33 AM   #1724
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Quote:
Originally posted by tl2111
Mark

what is your JP crank? IMFAR version or EFRA version? it does make some different also what pipe did you use? I find with 16% nitro 7mm hole crank works great on .2mm head shim and above 7.5mm then .3mm or .35mm is the way to go.
I'm using the EFRA legal version with the JP EFRA 2601 pipe.
What I found when I was using 0.2mm of head shims, the engine temp wouldn't come up - but this was with the original JP head and 18-20C air temp. Now I've replaced the JP head with a Novamega head & increaded the head shims to 0.3mm, I'm getting into 100C no problem - I'm sure there is still a bit more in there.
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Old 05-03-2005, 03:34 AM   #1725
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Quote:
Originally posted by tl2111
1 more things I found that with our BRB is you dont have to worry about the temp cos when its goes lean performance will drop stranght away, rich it performance will come back.
Yeah, I seem to see the same thing. With the motor idling, I found when I hit the throttle below two turns out on the LSN, the engine would stutter and then go. I richened the LSN and it was gone......my only fear is how close to this limit should I be.
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