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Re: 548 CI BBC Advice

Posted: Tue May 16, 2017 5:28 pm
by cstraub
TBART1970 wrote:Distributor not in far enough.
I appreciate you posting this. So many times the lifter gets blamed for the issue when in fact, as in this case, it is actually the lifter being abused because something else is not correct in the engine.

Re: 548 CI BBC Advice

Posted: Tue May 16, 2017 7:12 pm
by FC-Pilot
TBART1970 wrote:Distributor not in far enough.
Thanks for sharing this. It is never easy to admit that we makes mistakes some times, but the hope is that others will not make the same mistake that we do. Hopefully this will help others to make the same mistake. I know I will double check from now on.

Paul

Re: 548 CI BBC Advice

Posted: Wed May 17, 2017 6:17 pm
by TBART1970
Back from page two.
TBART1970 wrote:Issues should be good to go on pressure, first pump was Moroso billet pump, standard volume, dyno intake and dist. In the car Injected intake, different dist. Had pressure problems from beginning. Pulled the engine put in Titan gerotor pump, slightly better but still an issue. Titan pump has a different drive at the pump and I made the mistake twice of not checking the distributor/ gear / galley alignment. Mismatched parts and trying to solve it in the car. I will take the blame, my builder is helping me fix this. I assumed (oh boy) that the intake/ distributor would not be an issue.

Re: 548 CI BBC Advice

Posted: Tue May 23, 2017 12:21 pm
by TBART1970
Heads are at Ceralli engines for valve job, and going to John at CFMcnc in Florida.
They need some port work.

Re: 548 CI BBC Advice

Posted: Tue May 23, 2017 12:22 pm
by cstraub
TBART1970 wrote:Heads are at Ceralli engines for valve job, and going to John at CFMcnc in Florida.
They need some port work.
Bill Cerrelli is good people.

Re: 548 CI BBC Advice

Posted: Fri Jun 09, 2017 8:58 pm
by TBART1970
Valve job alone made better flow #s. Porting made even better gains in CFM, without adding much CSA, according to the cylinder head guy. Thanks to John at CFMcnc head porting. Looking in to getting another cam (Cam King are you listening). When the heads get back to Ceralli, they will get milled and re-flowed with the intake manifold. Then I will decide.

Re: 548 CI BBC Advice

Posted: Sat Aug 05, 2017 8:43 pm
by TBART1970
anyone like to guess at the dyno numbers? New compression ratio 10.24 to 1
IMG_20170805_192638298 eng2 (2).jpg
IMG_20170628_160139853 eng3 (2).jpg

Re: 548 CI BBC Advice

Posted: Sat Aug 05, 2017 11:35 pm
by fdicrasto
Why not. 820-840 hp.

Re: 548 CI BBC Advice

Posted: Sun Aug 06, 2017 9:26 pm
by TBART1970
fdicrasto wrote:Why not. 820-840 hp.
Is that a serious, calculated guess?

Re: 548 CI BBC Advice

Posted: Mon Aug 07, 2017 8:07 pm
by TBART1970
No guesses?

Re: 548 CI BBC Advice

Posted: Mon Aug 07, 2017 9:40 pm
by MadBill
It's like a woman asking you how old you think she is. Honesty is not the best policy. If you subtract too many years from your answer she knows it's B.S. but she doesn't mind. Thus the easy path is to go low on age, high on HP.

So here's me not taking my own advice: 790 HP @ 6,000, 750 lb-ft. @ 4,800.

Re: 548 CI BBC Advice

Posted: Mon Aug 07, 2017 9:55 pm
by TBART1970
739.9 hp at 6000
727.8 tq at 4800

I was hoping for 700-715. I am happy.

Re: 548 CI BBC Advice

Posted: Mon Aug 07, 2017 10:01 pm
by MadBill
Well at least I got the peak revs right... #-o

Re: 548 CI BBC Advice

Posted: Mon Aug 07, 2017 10:08 pm
by TBART1970
Thanks everyone for all the help. Letting me know about the head flow deficiency and cam advice.
Now to get it back in the car and start tuning again.

Re: 548 CI BBC Advice

Posted: Tue Aug 08, 2017 9:57 am
by cstraub
""Hello everybody, I have a 548 CI BBC, New Gen 5 Bowtie block, 4.600 bore, 4.125 stroke, 9.7 :1 compression. I was with the engine builder every step of building this thing. It had a Straub Technologies custom Hydraulic Roller cam with Morel hydraulic lifters. On the dyno with a small intake and 850 carb it made 690 hp and 750 ft. lbs. torque."

Tom,
So you lost power over my smaller cam. If dyno'd with the larger intake and larger carb based on the Ft/lbs of torque you would have made more HP also.