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Are Alcohol Heads different Than Fuel #224292 02/14/09 10:33 AM 02/14/09 10:33 AM
Joined: Feb 2005 Posts: 957 MI, Lapeer M maximus OP super stock
maximus OP super stock M Joined: Feb 2005 Posts: 957 MI, Lapeer	Just have a quick question are alcohol heads different design than gas/fuel heads on a hemi, or are they the same between the two fuels? If they are different what are the changes? Also what are the differences in piston design? Would an alcohol head work on a fuel motor with correct pistons? Thanks Last edited by maximus; 02/14/09 11:29 AM.

Re: Are Alcohol Heads different Than Fuel [Re: maximus] #224293 02/14/09 12:15 PM 02/14/09 12:15 PM
Joined: Aug 2005 Posts: 637 Sao Paulo, Brazil dart_73_br mopar
dart_73_br mopar Joined: Aug 2005 Posts: 637 Sao Paulo, Brazil	The main difference is that you need more CR to run Alcohol, so a minor chamber. I think > 10.5:1 CR should be fine! Sorry... I tought in ethanol.... here in Brazil is full of Alcohol cars... or ethanol.... Last edited by dart_73_br; 02/14/09 03:50 PM.

Re: Are Alcohol Heads different Than Fuel [Re: maximus] #224294 02/14/09 01:27 PM 02/14/09 01:27 PM
Joined: Jan 2003 Posts: 1,938 Sonora CA Mopar_Rich top fuel
Mopar_Rich top fuel Joined: Jan 2003 Posts: 1,938 Sonora CA	They can be swapped, but there are a few differences. Most Alcohol heads use special head studs that allow the removal of the rocker gear without affecting head torque. It's a special stud with two nuts. The head must be cast and machined for this. Fuel heads also run rocker arms with no roller tips (at least on the exhaust). The valve sizes are a little different too because it has more effect with an alcohol motor. The CR is different, but that's up to the piston not the head.

Re: Are Alcohol Heads different Than Fuel [Re: maximus] #224295 02/14/09 01:52 PM 02/14/09 01:52 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: Just have a quick question are alcohol heads different design than gas/fuel heads on a hemi, or are they the same between the two fuels? If they are different what are the changes? Also what are the differences in piston design? Would an alcohol head work on a fuel motor with correct pistons? Thanks There are many differences between fuel and alcohol heads, so NO they are not even close to being the same. Fuel heads has down nozzles that alcohol heads doesn't have for one. web page

Re: Are Alcohol Heads different Than Fuel [Re: Challenger 1] #224296 02/14/09 02:54 PM 02/14/09 02:54 PM
Joined: Jan 2003 Posts: 1,938 Sonora CA Mopar_Rich top fuel
Mopar_Rich top fuel Joined: Jan 2003 Posts: 1,938 Sonora CA	Good point - I totally overlooked that. Here's a pic of a Top Fuel head showing the nozzles. 5024722-TopFuelvalvetrain.jpg (222 downloads)

Post deleted by Defbob [Re: Mopar_Rich] #224297 02/14/09 07:30 PM 02/14/09 07:30 PM
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Re: Are Alcohol Heads different Than Fuel #224298 02/14/09 08:09 PM 02/14/09 08:09 PM
Joined: Oct 2006 Posts: 4,590 Indy J joshking440 Lunch is on me!
joshking440 Lunch is on me! J Joined: Oct 2006 Posts: 4,590 Indy	But for the most part they are the same in basic design I would bet that an Alcohol Motor would run on Nitro with just cam, injector, and compression changes...like thats no big deal...

Re: Are Alcohol Heads different Than Fuel #224299 02/14/09 09:27 PM 02/14/09 09:27 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: if we talk billet heads What else is there in alcohol/nitro racing? Last edited by Challenger 1; 02/14/09 09:30 PM.

Re: Are Alcohol Heads different Than Fuel [Re: maximus] #224300 02/14/09 09:46 PM 02/14/09 09:46 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Just have a quick question are alcohol heads different design than gas/fuel heads on a hemi, or are they the same between the two fuels? If they are different what are the changes? Also what are the differences in piston design? Would an alcohol head work on a fuel motor with correct pistons? Thanks Are you saying fuel as in gasoline OR fuel as in a top fueler... because the only differences in my alky head vs a gas head was the valve dia, being the alky head gets a larger valve dia..... this is on a W-9

Post deleted by Defbob [Re: Challenger 1] #224301 02/14/09 10:20 PM 02/14/09 10:20 PM
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Re: Are Alcohol Heads different Than Fuel #224302 02/14/09 10:30 PM 02/14/09 10:30 PM
Joined: Feb 2005 Posts: 957 MI, Lapeer M maximus OP super stock
maximus OP super stock M Joined: Feb 2005 Posts: 957 MI, Lapeer	I am talking alky and gasoline. Sorry about the confusion. Would alcohol heads work on a street/strip motor? These are DART hemi heads I am taking about. Thanks Last edited by maximus; 02/14/09 10:32 PM.

Re: Are Alcohol Heads different Than Fuel [Re: maximus] #224303 02/15/09 06:37 AM 02/15/09 06:37 AM
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Anonymous Unregistered A	I have seen this kind of post on other sites and I think one thing that no one ever asks is what kind of preformance are you looking to get? If you mean will the motor run then yes. Will it get more hp and or tq from one to the other then that is where the debate is. There are a ton of differences in the hemi head world.The older heads stay alot closer to the standard 426 heas but the later model stuff is way different.Just my 2 cents

Re: Are Alcohol Heads different Than Fuel #224304 02/15/09 07:10 AM 02/15/09 07:10 AM
Joined: Jun 2007 Posts: 55 Maple Ridge, BC, Canada N NitroFixx member
NitroFixx member N Joined: Jun 2007 Posts: 55 Maple Ridge, BC, Canada	Alan Johnson Billet fueler heads with nozzles, lines and rails. 5026187-+injector_nozzles_in_cylinder_head.jpg (82 downloads) Last edited by NitroFixx; 02/15/09 07:11 AM.

Re: Are Alcohol Heads different Than Fuel [Re: Mopar_Rich] #224305 02/15/09 07:13 AM 02/15/09 07:13 AM
Joined: Jun 2007 Posts: 55 Maple Ridge, BC, Canada N NitroFixx member
NitroFixx member N Joined: Jun 2007 Posts: 55 Maple Ridge, BC, Canada	combustion chamber of Alan Johnson Fueler head 5026189-alan_johnson_stage_v_cylinder_heads.jpg (299 downloads)

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