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Old 01-07-2007, 07:13 PM   #46
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Do these engines need to be shimmed if planning to use 30%? if so, then by how much?
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Old 01-08-2007, 06:49 AM   #47
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Do these engines need to be shimmed if planning to use 30%? if so, then by how much?
Engine comes with two 0.20mm (0.40mm) shims underneath the combustion chamber, good for 16 to 20% nitro.

You may want to adjust the shims depending on nitro-content (see table) Nitro content: 16%/ 20% / 25%/ 30%
Head shims: 0.40mm / 0.40mm / 0.50mm / 0.60mm

Large tracks may require an extra 0.10mm shim to reach higher top speed and improved fuel consumption, but this will decrease acceleration slightly.


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Old 01-08-2007, 12:24 PM   #48
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Do these engines need to be shimmed if planning to use 30%? if so, then by how much?
The JL engines comes shimmed ready for 30% nitro already, meaning you don't have to do anything to the engine as far as preparation.
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Old 01-08-2007, 01:02 PM   #49
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The JL engines comes shimmed ready for 30% nitro already, meaning you don't have to do anything to the engine as far as preparation.
You are right, let me correct myself....they come with two 0.20mm shims and one 0.10mm shim, for a total of 0.50mm shims, which gives us a real head clearance of 0.55mm, which is right on the limit between using 25% or 30% Nitro.

If you feel you need more top end with 30% Nitro, I would add one 0.10mm shim, for a total of 0.60mm.

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Old 01-08-2007, 01:57 PM   #50
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thanks fellas for the info. Sam, once again, I will be in of Friday to pick this engine up so that I can race this Sun. How tanks to break in?
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Old 01-08-2007, 06:09 PM   #51
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1 tank
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Old 01-10-2007, 11:22 AM   #52
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What about parts availability and prices: piston/sleeve....crank...bearings...plugs

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Old 01-11-2007, 08:20 AM   #53
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can someone explain the diff between ifmar and efra spec crankshaft and which is better?
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Old 01-11-2007, 08:57 AM   #54
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can someone explain the diff between ifmar and efra spec crankshaft and which is better?
For .12 engines

Before November 2006 EFRA rules limited the crank's inner passage to a max. 7.0mm diameter with no chamfer at the oulet, and turbo scoop couldn't be connected to inner passage.
IFMAR had no limits to what could be done to crank.

After November 2006, EFRA has changed their rules to match IFMAR rules, so now they are the same, you can freely modify cranks in both formats.

As a side note: Some manufacturers like Picco don't belief that widening the inner passage will provide real benefits to an engine's performance, because you are restricted by rules to a max carb venturi of 5,5mm, and exhaust oulet is also restricted by rules to 5.2mm, so they just work on the turbo scoop to improve flow on IFMAR spec engines (and now EFRA).
Other manufacturers have inner passages up to 8.0mm wide (like Sirio for example)

It's a debatable technical situation...I guess both are right, depending on their engine design on crakcase volume.

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Old 01-11-2007, 08:16 PM   #55
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Default Performance Test

I tested the in car performance of the stock engine today. Wow it is very fast, and smooth. It also gets good fuel consumption. Not exactly sure how good, but it is noticeable. The engine was easy to break in, and it holds an idle very well. I tested with the Skyline VR12+. I did not see the need to try any thing else. This is definitely one of the fastest stock engines I have seen. Now it is time to test the mod version!
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Old 01-12-2007, 06:28 AM   #56
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I tested the in car performance of the stock engine today. Wow it is very fast, and smooth. It also gets good fuel consumption. Not exactly sure how good, but it is noticeable. The engine was easy to break in, and it holds an idle very well. I tested with the Skyline VR12+. I did not see the need to try any thing else. This is definitely one of the fastest stock engines I have seen. Now it is time to test the mod version!
Great news Uriah.....I got mine and will be testing this weekend, but since i didn't got my Skyline pipe yet, I will be using my old faithfull Mugen Shimo pipe.....will share my experience later...

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Old 01-12-2007, 07:03 AM   #57
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Thank God it Friday!! I'll be picking mine up today for racing this weekend. I'm glad to hear Uriah's reviews as it's validated my own experience with this engine. I will also be using the skyline vr12+ pipe. Brian Thomas also spoke highly of this engine
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Old 01-12-2007, 09:41 AM   #58
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Really, Hmmmm let's see.
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Old 01-13-2007, 12:50 AM   #59
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talk about easy break in process, it's so easy it's almost scary
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Old 01-13-2007, 01:14 AM   #60
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Quote:
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talk about easy break in process, it's so easy it's almost scary
Is it ready to woop some a$$ on Sunday
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