| Re: Re: Re: Re: Re: LPG Conversion Kits Posted by Peter on August 13, 2001 at 07:17:46: In Reply to: Re: Re: Re: Re: LPG Conversion Kits posted by Jminerva on August 11, 2001 at 20:38:17: "Like all things, there are differences of opinions, I think that even with engines with unleaded compatitable valves and seats It is not the Rockwell 'hardness' that makes the seats work, it the lack of 'welding' of the seat and valves together under heavy load, having seats that are too 'hard' causes its own problems, as noted. There is a load below which the temps and pressures are to low to cause welding, obove this line failure is rapid and inevitable. Check with your local industrial pump or tractor motor rebuilder and check the optional parts for LP use." I've seen heaps of systems fitted on Aluminium cyl heads and never had to change valves or seats - never had a come back (some have done over 100,000 kms). I'm real sure what your trying to discuss here. Rockwell testing re seats and LPG has never been a consideration. It was in past times with induction hardened cast iron cylinder head seats but that is not what is being discussed here. "I stand by my opinion on the single vs dual injection points, it is true that if you inject before dual throttle plates, they will separate the dual planes of the inlet manifold. (Refer to Philip Smiths excellent book, "Scientific Design of Inlet and Exhaust Systems' published by Bentley Press. Also, since they make single and dual point injection, and the dual is considerabley more expensive, if they wern't better, they wouldn't sell many, in a large part one gets what they pay for. Some people are willing to suffer more than I for either real or imagined benefits." Once again fail to see what you are getting at here??. If there is a single throttle body (Fuel injected System) and the customer wants a cheaper system, one is fitted (Donut or gas mixer). If they want the expensive option, each inlet manifold tract is drilled and LPG injectors/nozzles are fitted. Never said LPG was used on race cars - I said CNG (130 octane) "Let me know your final decision and how well you are satisfied with the result, I'll put it in ye olde memory banks and use it later."
Peter
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