need help

Want to know how to get more out of your Beretta? Or have a mod you would like to share?
Post Reply
oliver
Registered User
Posts: 13
Joined: Tue Apr 15, 2014 12:28 am
Location: Phoenix Az

need help

Post by oliver »

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?


Please Be Patient
Even a Toilet Can Handle
One Ass Hole At a Time
Cliff8928
Administrator
Posts: 1775
Joined: Wed Mar 03, 2004 10:03 pm
Location: Long Grove, IL
Contact:

Re: need help

Post by Cliff8928 »

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.


Cliff Scott
Image
oliver
Registered User
Posts: 13
Joined: Tue Apr 15, 2014 12:28 am
Location: Phoenix Az

Re: need help

Post by oliver »

Thanks for the info


Please Be Patient
Even a Toilet Can Handle
One Ass Hole At a Time
User avatar
Rettax3
Registered User
Posts: 1805
Joined: Mon Oct 22, 2012 3:34 pm

Re: need help

Post by Rettax3 »

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 SuperCharged 3800 Srs-II (First)Six-Speed GTU
1990 Turbo 3.4 5-Speed T-Type
1990 4.0L 4-Cam 32-Valve V-8 5-Speed Indy GTi (Project)
1990 Stock(!) 3.1 MPFI Auto Indy
1995 LA1/L82 4T60E Z-26
1995 3.4 DOHC Turbo 5-Speed Z-26
Post Reply