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Old 06-13-2008, 10:17 AM   #1546
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Originally Posted by SRW141 View Post
On the red dot. On a really humid day. What is the best thing to do, not to get it to over heat? Last weekend I richened the top end. But I think I should have done the bottom end.
When it is hotter and/or more humid, you are getting less oxigen into the engine. So you are already richer, assuming no adjustments have been made.
Bottom end should be adjusted so that NO fuel/air ratio change occurs when transitioning from low to high. Other words, actual fuel/air ratio should be the same at 10% throttle as 100%, or at least very close to the same.
The solution offered before is the correct one. hotter plug will allow a richer setting. Heat will not disipate as well on hot humid days, so you may need to run the engine richer than you would like, but don't try to tune to the same temp as you would on a cooler/drier day. It is going to run a bit warmer
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Old 06-16-2008, 02:40 AM   #1547
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does anyone know what the needle settings are for thhe JLR .12, its not the EVO3, but i think its one of the first JLR.12, says OFNA-PICCO_JL on the head.

fairly new to nitro on-road, so dont want to mess this engine up with incorrect tuning, so i guess it will be best to start off with standard needle settings and work my way from there, i broke then engine in using heat cycle method, idled for 2 mins, let the engine cool right down and then idle again for two mins, doing this for about 8 times, then richened the needle from "box" settings about 1/4 turn and ran about two tanks, engine boggs a bit, but i dont want to mess with the needle settings until i know what the standard settings are.

temps here are around 28-32 deg/cel with 60-70% humidity, we run 16% here as well.


please help

Last edited by rias5037; 06-16-2008 at 03:58 AM.
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Old 06-16-2008, 05:20 AM   #1548
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Originally Posted by rias5037 View Post
does anyone know what the needle settings are for thhe JLR .12, its not the EVO3, but i think its one of the first JLR.12, says OFNA-PICCO_JL on the head.

fairly new to nitro on-road, so dont want to mess this engine up with incorrect tuning, so i guess it will be best to start off with standard needle settings and work my way from there, i broke then engine in using heat cycle method, idled for 2 mins, let the engine cool right down and then idle again for two mins, doing this for about 8 times, then richened the needle from "box" settings about 1/4 turn and ran about two tanks, engine boggs a bit, but i dont want to mess with the needle settings until i know what the standard settings are.

temps here are around 28-32 deg/cel with 60-70% humidity, we run 16% here as well.


please help
HSN is 4 turns out from close
LSN is 6 turns out from close
These settings are on my Evo3 (new and unused) and should be the same for all
Cheer's Rob
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Old 06-16-2008, 01:56 PM   #1549
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thanks rob, also a serpent dealer here sell mega plugs, which i assume are the same as picco plugs, would i be correct in saying that a hot no.6 mega plug will be fine. we runs 16% and i removed a shim, engine only had 3 vbrass shims when i took the head off, didnt have anything to measure head clearance so i just removed one shim, so the engine only has two brass shim in it now, will this be fine for 16%.


thanks
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Old 06-16-2008, 02:04 PM   #1550
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Originally Posted by rias5037 View Post
thanks rob, also a serpent dealer here sell mega plugs, which i assume are the same as picco plugs, would i be correct in saying that a hot no.6 mega plug will be fine. we runs 16% and i removed a shim, engine only had 3 vbrass shims when i took the head off, didnt have anything to measure head clearance so i just removed one shim, so the engine only has two brass shim in it now, will this be fine for 16%.


thanks
You will need to have .30mm total shim thickness if runninf 16%, I suggest you use a vernier caliper to measure the shim thickness.
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Old 06-16-2008, 02:13 PM   #1551
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the engine (old JLR) had three brass shims, all look like the same thickness, so i would assume the it was shimed to .30, so should i put the one brass shim i took off back, engine only has 2 shims now.
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Old 06-16-2008, 02:17 PM   #1552
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the engine (old JLR) had three brass shims, all look like the same thickness, so i would assume the it was shimed to .30, so should i put the one brass shim i took off back, engine only has 2 shims now.
Yes put back the shim that you took off.
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Old 06-16-2008, 02:21 PM   #1553
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thanks sam, will do, also thinking of getting the newer version as a back-up engine, what is the dif between the EVO3 and the Tuned version. please also check out you pm, need to know what it would cost to ship an engine here
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Old 06-16-2008, 03:22 PM   #1554
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What's head clearence for 20% and 16 nitro?
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.40mm shims for both 16% and 20%, the new JL3 EVO3 comes with .60mm shims which is ready for 30% nitro.
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Bummer, Where can i get the .40mm shims from as we only run 16% or are there seperate shims you can remove to bring it down to .40mm
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Yes, just take off the 2 x .1mm shims or 1 x .2mm shim either one is okay.
the engine have 2 x .2mm shims and 2 x .1mm shims
This where i got my information on shim clearance now you say .30mm, a bit confussed now, this is from november last year Pge 29-post 861 and assume this would be the same for all JLR's
Cheer's Rob
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Old 06-16-2008, 03:29 PM   #1555
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Rias,

Just make sure that the plugs that you can get from Dave/Mike (serpent) are the picco based mega plugs and not the Nova based plugs. Then they should be fine. I use the No6 plug up here in Pretoria.

If you go to Sam's site it will tell you what shipment is to SA. Go through the process of ordering one, and you will see that it includes shipment fees to SA. I've ordered twice from him now, and the service is good. (sorry, its excellent) (Even to SA )

You can get plugs and a pipe from him as well.
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Old 06-16-2008, 05:07 PM   #1556
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This where i got my information on shim clearance now you say .30mm, a bit confussed now, this is from november last year Pge 29-post 861 and assume this would be the same for all JLR's
Cheer's Rob
I am confused too , Rob you are correct it should be .40mm not .30mm as I just posted.
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Old 06-16-2008, 08:47 PM   #1557
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JL12 ran around 300 today. what should i check for in my motor. i could tell it was kinda hot due to power loss. but it won me the A main, so i wasnt stoppin!!!
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Old 06-16-2008, 09:01 PM   #1558
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You obviously run it too lean, now to inspect your engine, take off your Cooling head and check you Head button and the piston top for detonation (pit marks) if it has detonation marks then it did overheat, I would change the head button so it will be smooth again for better combustion and the connecting rod for safety measures, overheating does weaken the Rod.
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Old 06-16-2008, 09:22 PM   #1559
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thanks, i think im gonna order a rod and some gaskets this week from u. hit u up soon
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Old 06-16-2008, 11:14 PM   #1560
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thanks pro-e, hey rob, just pulled the head off again, here is what this engine was shimmed with out the box:

2 .20 shims
1 .10 shim.

not 100% sure but there are a total of three shims, two thicker ones and one thin one.


so the head clearance for 16% will be .30, so i take of one .20 shim right?
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