As far as reliability goes, are we today seeing built 4b11's lasting as long as built 4g63's? Or 4b11's of similar power to 4g63 holding up equally well.

This is not a "VS" thread so no bashing please, i own both platforms and am just asking for an idea how far the 4b has come and if people feel it has reached its peak or are we still seeing progressions with it.

I know the 4g63 is damn near 30 years old and has had a ton of time to improve and R&D into it so its not really a fair comparison, just looking to hear opinions

 

No issue with my AMS 2.4. I'd say that it's right up with the 4G63 easily in a shorter period of time. I'm making better power with my X then I did with my IX. I truly believe that modified engines are only as good as the builder.

 

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How long have you been on that setup?

 

might be diving into a built motor soon, would like to know myself

 

i have 0 issue with my build since 2011.
Granted mine is a very very light build compare the most of the build. Pistons - rods - cams . Stayed 2.0l No porting, nothing. Everything else is OEM, even the gaskets etc. Stock turbo with 34 mm restrictor plate. Top PSI is 24.
CP pistons
Manley H beam rods
Cosworth cams
ARP Head studs
Slightly raised compression.
316 whp and ~450 wtq. on dynodynamics. top 24 PSI on 104 racegas.


i hope its help .

 

How safe are basic builds at around 5-600ho? Buy basic meaning just internals no headwork.

 

I would like to say/think that the 4b11 hasn't reached its full potential yet. I mean shops are still doing R&D on the 4g63 and finding things out, which is almost 30 years old like you said. You see ETS setting new records like every week it seems like. You even see people making VERY good numbers on a completely stock motor and that lasting them a while.

Like said above, the motor is as good as the builder/tuner. Also can include owner in there with that because the owner is the one that maintains it of course.

 

I agree that it is still progressing.

 

I have first hand experience with breaking 4g63 engines. One on a dyno was knocked to death by morons the 2nd (built) was oil pressure loss. Both resulted in spun rod bearing. I think the 4b11t got a bad rap early due to things like the fuel pump relay. You lean this motor out and knock hard at high rpm and those rumored weak rods/bolts are going to give. Conversely in the hands of a pro tuner I read something like 600hp/500tq was used for a while before a rod bent. Will have to come back and edit for that link. I added 140hp to the stock block (2012 MR) with ease, performing all my own work and tuning. In that sense the platform is on par with the old. You don't hear about blocks breaking or distorting until over 600 so the aluminum versus steel block comparison is moot from my perspective. My 2 cents.

 

Seems like it just comes down to tuner/build. Its not like 4g63's dont blow left and right either.