| Author | Message | ||
| Kent R. DeAvilla (Lust4spyders)
New member Username: Lust4spyders Post Number: 40 Registered: 1-2003 |
Mark, I'd love to supercharge my 3.2 Mondial cabriolet with low boost 6psi. Can you steer me in the right direction. My engine is being rebuilt as I speak and the carshould be ready for pick-up on Monday 6/16. I can't wait! | ||
| Mark Eberhardt (Me_k)
Member Username: Me_k Post Number: 550 Registered: 5-2002 |
I forgot, the one really surprising thing you can do is put in a k&n air filter. The dyno numbers Rob posted said it was good for 16 hp. I couldn't believe ferrari screwed that up so bad. http://www.ferrarichat.com/discus/messages/256120/229975.html | ||
| Mark Eberhardt (Me_k)
Member Username: Me_k Post Number: 548 Registered: 5-2002 |
The heads on my QV are factory ported and I suspect all Ferraris, including the 3.2 are. They blend the seat and finish the port with about 120 grit, pretty nice really. Dave covered most of the important points I think. The main restriction is the very short duration cams required by the CIS injection. If you change the cams (I would think about 20 degrees more duration), bring the compression up, open up the exhaust, and convert to EFI, you will make 60 or 80 more hp. You might gain something by doing the heads, but it will be much closer to zero than 60, I would guess 10 is about it. Have you considered a turbo or blower? That would net you another 100 or 200�..boost is your friend  | ||
| chaz richards (Chaa)
New member Username: Chaa Post Number: 20 Registered: 5-2003 |
So what you are saying is that a ferrari engine does not respond to conventional head porting work.Interesting after all it is still only a Combustion engine is it not.And i would say that regarding head work, there are companys who guarantee BHP increases on a particular head that they may specialize in,usally with power graphs. granted not nearly as much as 60 BHP ofcourse but head work on a conventionl engine does gain results if done professionally. | ||
| Tom Bakowsky (Tbakowsky)
Member Username: Tbakowsky Post Number: 427 Registered: 9-2002 |
Well said David. | ||
| David McAlexander (Stuttgartdavid)
New member Username: Stuttgartdavid Post Number: 20 Registered: 5-2003 |
Hate to rain on parades here, but: The 3.2 head was freshly redesigned by the factory to work in harmony with all the other upgrades to the 3.2 (improved cam, different piston shape for better combustion, smaller spark plugs, etc). It already has about as much increased airflow as your engine can use without radical changes! By the way, a 60hp increase in on the order of 20% - an unfathomably massive improvement for one relatively minor change. Even if the head was overly restrictive in stock format, which I very much doubt, merely opening it up and increasing potential airflow will not give you better breathing without more cam, exhaust etc. to take advantage of any improvements. The camshaft is the heart of any engine and dictates both airflow and powerband. Since the Bosch FI system can't handle a very aggressive cam without its airflow sensor freaking out, you are cam-limited unless you go with a different intake system - big bucks! There are only 2 ways to get more power out of an engine: 1) increase its efficiency as an airpump (not possible here without cam, intake and exhaust changes, which have their own tradeoffs in reduced powerband and reliability) or 2) increase its thermal efficiency (real rocket science, and an area the manufacturers have pretty much maxed out given current technology). Lastly, porting or polishing can often hurt, not help. If you make the ports too big, intake charge velocity declines at everything except max rpm, so your torque goes to hell - reference Ford's failed Boss 429 here - it should have been a giant killer, instead it stank on the street because its ports were so large the intake charge didn't know which way to go under 6500rpm. And "Polishing" is an antique hotrodding concept that stopped being applicable after decent head casting came along after WWII. Ask any fluid dynamics engineer: a perfectly smooth surface is not the ideal for airflow - it has a larger boundary layer that detaches more easily and reduces laminar flow. All modern high-performance engines have a slight "tooth" to the intake tract to keep the boundary layer of air attached so it doesn't interrupt the primary airflow channel. Going mirror-smooth may look cool, but will slow you down! The only place for a mirror polish finish might be the combustion chamber for heat-rejection, and even then there are now better techniques like advanced coatings. So no, I suspect that if Ferrari could get another 60 hp with a quick port and polish, they would have done it already. These cars are well enough engineered for their intended application that "there ain't no free lunch." | ||
| Kent R. DeAvilla (Lust4spyders)
New member Username: Lust4spyders Post Number: 35 Registered: 1-2003 |
I heard of a guy named Christian up in Canada who had his heads ported on his 3.2 Mondial Coupe by Nick's Forza Ferrari. I heard its faster than his 348 and faster than his Testarossa up to 100 mph. It's a pleasant thought... | ||
| Randall (Randall)
Member Username: Randall Post Number: 534 Registered: 1-2003 |
If you do it, I'd love to hear the results. It's a $3k gamble. If they back their work with aome % money back guarantee it would be more tempting. | ||
| Kent R. DeAvilla (Lust4spyders)
New member Username: Lust4spyders Post Number: 34 Registered: 1-2003 |
My 3.2 engine is being dismantled as I speak at Brian Jessel Ferrari/Sport Cars in Vancouver, B.C. We are doing a complete rebuild. I have fantasized about a rumoured 60hp increase from having my heads ported & polished through SP Performance in the U.K. Has anyone out there had this done? Or, does anybody know of someone who has. I'de like some references. I'm nervous to turbo charge the car(via James Patterson at Norwood Autocraft) because of recourse. I live in Seattle, James is in Dallas. Asides from healthy optomism, what are the actual dyno results from just porting?. |