Author	[Modern View]
Ultradog MN 01-22-2013 05:38:16 184.100.109.75 Report to Moderator	Were the gassers subject to the same cavitation/porosity problems as the diesels were? I've read lots of posts about cavitation in diesels but never once about it in a gasser. Kenny just found out he has the dreaded cylinder wall rust-through on that junky 4600 he's working on. We were thinking it would be cheaper to use a gas block that I have rather than the expense of having it sleeved. Thanks [Reply]   [No Email]
Ultradog MN 01-23-2013 19:30:06 184.100.109.75 Report to Moderator	Re: 201 gas vs diesel in reply to Ultradog MN, 01-22-2013 05:38:16   Thanks fellows. I think he's going to bore and sleeve the block he has. Mainly because the block I have is the old style with the screw in plugs. Means he'd have to go back to a generator to run the tach. I have a set of NOS sleeves he's going to use. I also have an NOS 4600 head he's going to take. Going to trade me for his old head. Such a deal. I think I'll go to bed now and cry. [Reply]  [No Email]
Jerry/MT 01-22-2013 12:58:16 206.183.116.145 Report to Moderator	Re: 201 gas vs diesel in reply to Ultradog MN, 01-22-2013 05:38:16   The initial combustion pressure rise due to compression ignition is more like "knock" in a gas engine and so that"s why the problem occurs. [Reply]  [No Email]
soundguy 01-22-2013 12:15:43 173.105.127.170 Report to Moderator	Re: 201 gas vs diesel in reply to Ultradog MN, 01-22-2013 05:38:16   i've also hear leass/no issue with gassers.. however I still run the DCA addatives in my gassers. [Reply]  [No Email]
Paul in MN 01-22-2013 09:58:33 174.20.128.5 Report to Moderator	Re: 201 gas vs diesel in reply to Ultradog MN, 01-22-2013 05:38:16   I've paid mild attention to this topic for a number of years as I have 3 401 6 cylinder diesels plus Ford Powerstroke PU engines (none of which have showed this problem). The industry sources say the cavitation is due to the high level of diesel "ping" as it fires under load. This ping sets up the coolant touching the cylinder side into small bubbles. As the bubbles burst, the coolant slams back into the void and slams the cylinder sidewall hard enough to create the erosion. In the Powerstroke engines this can be greately reduced by using the Ford coolant additive. I think it acts like a soap keeping the coolant "wetter". Ford formulated a yellow color antifreeze with the same properties, so it does not need the additive. This same type of cavitation occurs in other brand tractor and truck diesel engines and is dealt with in a variety of methods. Our gasoline engines have never had any significant problem with these issues, as their combustion is more of a "woosh" than a "bang". Antifreeze formulated for big truck engines is a different chemistry than normal auto antifreeze. It does not have the silicates that auto antifreeze has. As to the interchangability of the gasser block and the diesel block, I have no real knowledge, but I'd sure have my doubts. Paul in MN [Reply]  [No Email]
RodInNS 01-22-2013 07:10:38 216.118.158.123 Report to Moderator	Re: 201 gas vs diesel in reply to Ultradog MN, 01-22-2013 05:38:16   I'd check the parts book and make sure the blocks are identical. I think they are... but check. Rod [Reply]  [No Email]
Dean 01-22-2013 06:31:44 67.172.15.77 Report to Moderator	Re: 201 gas vs diesel in reply to Ultradog MN, 01-22-2013 05:38:16   AFIK, there is no cavitation issue with the gasoline engines. Dean [Reply]  [No Email]
Texasmark1 01-22-2013 06:28:30 198.45.243.137 Report to Moderator	Re: 201 gas vs diesel in reply to Ultradog MN, 01-22-2013 05:38:16   Don't remember the color, but once I was reading parts lists on tractors and noticed that the bottom end of diesel's was a lot heftier than gas counter parts. One difference I recall is a main for each cylinder whereas the gas only had 3 for the whole engine. HTH, Mark [Reply]  [No Email]
Fordfarmer 01-22-2013 06:17:50 184.158.1.152 Report to Moderator	Re: 201 gas vs diesel in reply to Ultradog MN, 01-22-2013 05:38:16   AFAIK, the problem is more common in diesels, but the gassers aren't immune. If I understand it right, its more common in the diesels because of the higher combustion pressures, which result in more cylinder wall flex and the resulting cavitation. Using your gasser block will be cheaper IF it doesn't need to be bored out, but beyond that, you won't gain anything. [Reply]  [No Email]