1976 mopar hp factor

House of Darts · 02-25-2015, 07:11 PM

The 1976 318-2V Plymouth is rated at 140/150. Looked at the blueprint guide and all the specs are the same. The bottom line is that they have been refactored the same. Why is there a difference ?

Dwight Southerland · 02-25-2015, 11:02 PM

?? I see 185/195 like most other 318 2-bbl engines.

GTX JOHN · 02-25-2015, 11:50 PM

76 to 80 318 140 = 2 Barrel Not real fast

78 to 80 318 150 = Thermoquad 4 barrel Real Fast!

We have raced them both.

Mark Yacavone · 02-26-2015, 12:23 AM

I think the question is ..Why does the factory have two ratings for the same engine?

Answer : Don't worry about it. You're gonna have enough trouble making it run @190

Dwight Southerland · 02-26-2015, 09:24 AM

California versions were rated at 140, rest of the US rated at 150. Functionally for stock eliminator they are the same since all the major blueprint specs are the same and the Technical Bulletins bear this out. The difference was in the tuning via ignition, primarily governed by the introduction of the Lean Burn system that was introduced that year. Of course, CA had stricter emissions standards which translated into a less efficient engine package and thus the lower hp.

02-25-2015, 07:11 PM	#1
House of Darts Member Join Date: Mar 2007 Posts: 346 Likes: 19 Liked 20 Times in 15 Posts	1976 mopar hp factor The 1976 318-2V Plymouth is rated at 140/150. Looked at the blueprint guide and all the specs are the same. The bottom line is that they have been refactored the same. Why is there a difference ?

02-25-2015, 11:02 PM	#2
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 1,996 Likes: 63 Liked 756 Times in 189 Posts	Re: 1976 mopar hp factor ?? I see 185/195 like most other 318 2-bbl engines. __________________

02-25-2015, 11:50 PM	#3
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,708 Likes: 2,733 Liked 2,398 Times in 679 Posts	Re: 1976 mopar hp factor 76 to 80 318 140 = 2 Barrel Not real fast 78 to 80 318 150 = Thermoquad 4 barrel Real Fast! We have raced them both. __________________ John Irving 741 Stock 741 Super Stock

02-26-2015, 12:23 AM	#4
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,742 Likes: 2,843 Liked 5,002 Times in 1,902 Posts	Re: 1976 mopar hp factor I think the question is ..Why does the factory have two ratings for the same engine? Answer : Don't worry about it. You're gonna have enough trouble making it run @190 __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

02-26-2015, 09:24 AM	#5
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 1,996 Likes: 63 Liked 756 Times in 189 Posts	Re: 1976 mopar hp factor California versions were rated at 140, rest of the US rated at 150. Functionally for stock eliminator they are the same since all the major blueprint specs are the same and the Technical Bulletins bear this out. The difference was in the tuning via ignition, primarily governed by the introduction of the Lean Burn system that was introduced that year. Of course, CA had stricter emissions standards which translated into a less efficient engine package and thus the lower hp. __________________