Re: 1952 327 Connecting Rod Help/Suggestions

Posted by Fish'n Jim On 2019/1/14 22:52:01

I'd be interested to see some dyno results on this set-up to verify the HP, but don't know if that's in the program?

The HP curve from that can be used to determine the gearing, but you don't mention the trans, w/ or w.o OD?
It's possible to calculate the engine rpms at 80, with that gear info if you also know the tire size.
I don't see much issue with rpm with that rear end ratio.
The L8 327 is a stroked 288, so more rod travel, so would benefit from lighter/stronger pistons. These are fairly low (~8:1?)compression to begin with, so I wouldn't worry about the head issues. You won't see pre-ignition or detonation until much higher and partly an octane issue. Pressurizing changes the charge density affecting ignition also. So you have to check your "what to use for spark" plan too. That weak 6V probably won't cut it. Probably have to play with the timing which is dyno work. Whichever head is the stronger/best shape of the two is best. You can flow test, but not sure that's in scope either? There were some aluminum after market back in the day but scarce today. There's a few "P" L8s running around with turbos, but first I'm hearing with SC-er. The Frod flattie V8 hotrod guys are way ahead in this dept. I've always thought the inline siamese flatheads were not as good candidates for charging as the head strength/sealing comes into play which is not so much for the flat V configuration. What I remember from mechanical engineering calcs for bolting of flats. aka, why pressure vessels are not cubes.

Boost also increases the heat load, so that may need attention. (you double displacement for every 15 lbs boost) Stock water pump/radiator or aftermarket?

Sorry, interested, but I just don't get excited about making 250 Hp from such a heavy(800+#) 5.4l motor. An OHV straight six will do that at much less weight and many V4s. eg; 3.6 l V6 (naturally aspirated) in my new Cad is 310. The new 2.0 l V4 bi-turbo is ~240 and probably fits in your shirt pocket... So you pay a big price for the old school look. Good luck and keep us posted.