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Old 03-25-2005, 07:37 PM   #1
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Default P5 or 421B

Guys i need your input.. Looking at the specifications, 421B seems to be a better engine.. But i haven't heard much about 421B as compared to P5..My local track is quite technical with only 1 40 metres straight..
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Old 03-27-2005, 02:24 AM   #2
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Default p5 v's 421

I run the P5 in my MBX-5 at our track with is fairly long and have no troubles keeping up with any car on the track the P5 is awesome for fuel economy i get up to 10 minutes on a tank not running it lean either. the 421 heaps masses of HP but it is very peaky (another mbx-5 at our track has one.

while i cant say dont get the 421 i can definately recommend the P5 especially with the price difference
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Old 03-27-2005, 09:07 AM   #3
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P5 Hands down.Expecially on a technical track.I dont think there IS a better motor.
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Old 03-27-2005, 09:35 AM   #4
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If i get the P5, do i get the turbo or non turbo? Any changes needed e.g adding/removing of shims? And what plug do i use? Also how does P5 compare with OS V-Spec?
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Old 03-27-2005, 09:38 AM   #5
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Non Turbo.Use a plug you can find local.They will help you with what works.
Les
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Old 03-27-2005, 10:16 AM   #6
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Get the P-5 non turbo.The v-specs are nice motors ,but the P-5 is more reliable and it has way more bottom. People are also having problems with the outer bearing on the v-spec.
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Old 03-27-2005, 04:27 PM   #7
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Is the 421b's bottom end comparable or close to the p5's?
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Old 03-28-2005, 03:56 AM   #8
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the 421 is a top end motor where as the P5 is a broad range motor with heaps down low but still a nice amount of top end
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Old 03-28-2005, 02:33 PM   #9
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Go with a p-5 that motor is bomb proof. non turbo is a better choice because turbo plugs are sensitive to vibration. just match the motor to a good pipe and youll be fine.
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