The pipework is all OEM for the petrol injection, the gas mixer was just squeezed in where there was a bend originally.supersparky wrote: ↑Tue Nov 05, 2024 6:36 pmMaybe it needs a bit of a venturi effect to get the airflow required for the idle compensation to work correctly.T1 Terry wrote: ↑Tue Nov 05, 2024 4:58 pmThe whole air intake is a mess of reducers and expanders, the throttle body is a 4.5" sort of oval, down to a 3.5" LPG mixer, that goes to an adaptor that connects to the 3.5" pipe that goes through the firewall and then a 60* bend that brings it back up to 4.5" where it goes onto the air cleaner .... surely just making it 4.5" all the way would have been a heap easierjon_d wrote: ↑Tue Nov 05, 2024 3:14 pm https://www.ebay.com.au/itm/176232061381?
https://www.ebay.com.au/itm/124793745829?
https://www.ebay.com/sch/i.html?_dkr=1& ... hps%20oval![]()
T1 Terry
I wish some of my gas conversion mates from back in the day were still about and I could ask them.
I think it might have been to do with limiting the HP at higher rpm to make the torque curve a lot flatter. These were always designed to be a truck engine, yet people try to stuff them into cars where a Cleveland 351 was a tight fit.
There are some amazing after-market inlet manifolds, turbo exhaust manifolds and even 4 valve heads to build these into performance race motors .... don't know why you would bother with the high hp 5.2 ltr Mustang putting out 760hp and 665ftlb torque from the factory.
The 320hp and 460ftlb torque, all at around the 2500rpm to 3500rpm mark will do me, I doubt I'll ever enter it at The Bend Dragway


T1 Terry