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Old 04-12-2005, 07:00 AM   #1576
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Quote:
Originally posted by crashed_1
We've got racers in Malaysia hunting the BRB p/s down...CHRIS, get to work!...

Anyways, hope Palmaris will continue developing these wonder metals...
Working on it mate... working over time.
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Old 04-12-2005, 11:16 AM   #1577
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You might try a #7 plug. I tried a 6 here in TX and it was too hot.
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Old 04-12-2005, 11:35 AM   #1578
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Quote:
Originally posted by Surge
You might try a #7 plug. I tried a 6 here in TX and it was too hot.
i want to move to Texas . We are lucky if we get enough temp in Europe to get past a no5 plug most of the time .
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Old 04-12-2005, 07:20 PM   #1579
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Worked fine at 12C ambient this winter.
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Old 04-12-2005, 10:55 PM   #1580
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Old 04-13-2005, 02:20 AM   #1581
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Quote:
Originally posted by Surge
You might try a #7 plug. I tried a 6 here in TX and it was too hot.
I can't say it is universal, but here in HK, I have best result with #7 as well. For Temp from 10c or 30C, I always use #7.
Anything outside of that temp, I stay home...

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Old 04-13-2005, 02:25 AM   #1582
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Quote:
Originally posted by kitracer
For Temp from 10c or 30C, I always use #7.
Anything outside of that temp, I stay home...

Here, we often get 35 C ambient temperatures and we use 7tf and 0.3 mm shim with no problems too.
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Old 04-13-2005, 05:04 AM   #1583
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Dont know what your missing. Our first club race this year the temp was around 3-4 degC. The start of the first BRCA National round weekend the track was coated with ice

If we get 12 deg C before June we are out kissing the ground
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Old 04-13-2005, 05:57 AM   #1584
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Quote:
Originally posted by Palmaris Europe
If we get 12 deg C before June we are out kissing the ground
No you won't, you'll be in hospital being treated for extreme heat stroke
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Old 04-13-2005, 06:01 AM   #1585
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Quote:
Originally posted by markp27
No you won't, you'll be in hospital being treated for extreme heat stroke
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Old 04-13-2005, 07:37 AM   #1586
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Just thought I'd suggest it. Markp27's problem sounded either like a plug or a head shim. I've been running .4mm shims in my Rex with 3rd generation BRB and last weekend on my small local track tried .5mm and it worked maybe a little better. I suggest you try it and see what happens.
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Old 04-13-2005, 08:13 AM   #1587
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Quote:
Originally posted by Surge
Just thought I'd suggest it. Markp27's problem sounded either like a plug or a head shim. I've been running .4mm shims in my Rex with 3rd generation BRB and last weekend on my small local track tried .5mm and it worked maybe a little better. I suggest you try it and see what happens.
I thought the same at first. The Novamega cases are the only ones we had this problem with over here. With similar settings they have no Top end power. We only run 16% Nitro over here in Europe. With the Novamega case we are running 1 shim less to give that top end power.
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Old 04-13-2005, 08:31 AM   #1588
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There seems to be a lot of confusion regarding shimming and head clearance etc...

Shims are not dictated according to Nitro content, plug or weather conditions etc... Shims are set according to the amount of crankpin/conrod play, wristpin/conrod play, big end bearing play and how tight the P/S fit are.

The key is to find the correct shimming that produces the most power and torque from the engine. The closer you can get the head clearance, the more power and torque the engine will produce.

Many people declare that adding a shim is the correct thing to do when getting pre-detonation or blowing plugs but all they are actually doing is reducing the amount of usable power the engine can produce within its designated powerband. This then means you have to lean the engine out further to regain that lost power which puts the engine under increased stress.

Instead you should aim for a clearance that produces the most power and torque and keep the engine at this at all times. If pre-detonation or post-detonation occurs you should remedy this by increasing the squish area with that clearance to maintain the correct compression ratio. (making the squish area wider or narrower).

This will stop wrong detonation timing but keep the same power/torque level as was previously had. the engine will happily run that bit richer while still maintaining the desired punch from corners and pulling bigger gears.
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Old 04-13-2005, 08:40 AM   #1589
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Default Squish area

HI Campbell,

I agree with your statement regarding adjusting the head clearance for most power and torque. I have ran engine with no shim without any adverse effects ( the engine was very torquey !!! With the pre/post detonation parts, how do you change the squish area, i.e wider or narrower ?

Philip
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Old 04-13-2005, 08:49 AM   #1590
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Quote:
Originally posted by xtreme888
HI Campbell,

I agree with your statement regarding adjusting the head clearance for most power and torque. I have ran engine with no shim without any adverse effects ( the engine was very torquey !!! With the pre/post detonation parts, how do you change the squish area, i.e wider or narrower ?

Philip
Narrowing is not actually possible in a safe way. By wider or narrow I mean making the dome in the button wider or narrower.
To get it narrower you would need to know the exact area required and get a button made to suit. Just a matter of removing material from the appropriate place on an existing button to get it bigger.

I dont advise anyone to go try doing this unless they know exactly what they are doing and can make the proper calculations and changes to get the desired effect.
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