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Old 05-31-2007, 06:15 AM   #1
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Default JP FX21B-8T

Im geting one of these engines and would like anyones opinion likes, dislike's, preformance, fuel Consumption, how easy to tune

Technical Data FX 21 B-8TC. Capacity :3,49 ccBore :16,26 mmStroke :16,80 mmPorts :8 + 2 By passCrankshaft :ř 14 mmCarburetor :ř 8 mm + reducerGlow Plugs :TurboWeight :385 gr# FX 21 B-8T

Turbo Glow Plug

Turbo Glow Plug for best performances.

8 ports ABC Sleeve

This 8 ports sleeve is revolutionary in the Off-Road engine’s range. The exhaust has two boosters in order to increase performances and manage the fuel consuption on the best.

The last generation conrod is lightened with 2 bushings. The piston is also pierced to decrease the piston temp.

Turbo Crankshaft

The modified and lightened crankshaft is filled with the special red putty which is positionned to improve the gas passage. In order to reduce the friction and the wear, the crankshaft is HardBlack coated.
The Turbo design of the crankshaft's head highly improves the engine power. For best performances !


The special Off-Road carb is made of plastic in order to avoid the «vapor-lock». As all FX Engines, it has a simple adjustment (1 screw). The adjustment is easier

Last edited by Nitro$junkie; 05-31-2007 at 07:13 AM.
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Old 05-31-2007, 07:14 AM   #2
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I might be wrong but its a tuned version of a novarossi 421b.
CRT.5 SH .12,
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Old 05-31-2007, 04:20 PM   #3
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It's not a true 421,because it only has 4 head bolts BUT I will tell you this:
That is one incredlbely powerful engine ! but it is not the best on fuel , 6-7 minutes ,super bottom and mid range, after mod from RB mods it will be super smooth on the bottom with incredbley powerful mid and top! Best pipe for it is a 9886 with medium long to long header . I have 2 421's at my track and both of them are total animals ! And can beat up on C6's with ease. I have only seen 1 other engine that can run with them as far as speed and power and that was a JPmod V-Spec.
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