need help

Want to know how to get more out of your Beretta? Or have a mod you would like to share?
oliver
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need help

Postby oliver » Thu Apr 17, 2014 12:35 am

Can somebody tell me what kind of gains would i have
Boring a 3100 engine 30 over with a 3400 top end swap including 3400 heads as well
Is it worth it?


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Cliff8928
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Re: need help

Postby Cliff8928 » Thu Apr 17, 2014 3:10 am

The boring would be negligible, however the 3400 (or 3100 VIN J) top end has significantly larger intake ports. The Difference between the M and J 3100s is about 15 HP and FT-Lbs, not to mention increasing the power band.


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oliver
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Location: Phoenix Az

Re: need help

Postby oliver » Fri Apr 18, 2014 1:11 am

Thanks for the info


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Rettax3
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Re: need help

Postby Rettax3 » Fri May 02, 2014 2:20 am

My '95 Z-26 had a 3400 intake and TB on it, it definitely had more punch to it. I was missing the roller-rockers (and had to modify the lower intake manifold to clear the taller pivot-ball rockers from the 'M'-Code engine) used in the 3400s and 'J'-Code 3100s, which are probably good for 1-2 HP just by themselves.

The increased throttle-response was across the entire power-band, and I didn't encounter any negatives at all with the work on it. Worth it? I don't know if I can answer that, but there is a noticeable difference in performance for sure. :good:
Edit: X2 on what Cliff said so far as the .030 over-bore, I wouldn't bother with that unless the engine legitimately needed that much machining to be right again...


1989 Super Charged 3800 Series II (First)Six-Speed Conversion GTU
1990 Turbo 3.4 Five-Speed T-Type
1990 4.0L 4-Cam 32-Valve V-8 Five-Speed Indy GTi (Rebuild Project)
1990 Stock(!) 3.1 MPFI Auto Indy
1995 3400 Top-End Auto OD Z-26


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