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Want to Build Buick 455. Help Please

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ThatSupraGuy9801

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Post Wed Feb 25, 2015 7:36 pm

Want to Build Buick 455. Help Please

hey guys first post here, I like making copies of real engines. I've made quite a few accurate to: year, materials, compression, bore & stroke, HP & TQ, etc... One engine I've been trying to make however is giving me trouble, The Buick 455. This thing is a machine at 510lbs for a stock engine from the 70's is pretty good especially since it was just for cruising around. Plus it was a thin wall cast block which means this bad boy weighed 100lbs less that a Chevy 454, Again impressive. Now weight aside does anyone think the can make a copy, Because I sure can't.

Year: 1971
Power: 350hp@4600 510tq@2600
Bore: 4.31 in/109.5 mm
Stoke: 3.9 in/99.1 mm
Compression: 10.0/1
Iron head/ iron block
OHV/Pushrod
A single 4 barrel carburetor with standard filter
And a muffler,doesn't matter what type
The rest is less important to me

that's why I'm shooting for or as close as possible. If anyone wants to try and build such a thing and is successful please post back to this thread.
if anyone is interested in my copies please jus ask. I've made about 80 relatively accurate copies of many different engines, many being Toyota copies but that's probably only about 20-25 engines out of the 80, I have many others and would be happy to share them.

Please get back to me if anyone has any results
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Sayonara

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Post Wed Feb 25, 2015 10:30 pm

Re: Want to Build Buick 455. Help Please

I took a stab at it. Power and torque peak at the right RPMs but are slightly higher and lower than the actual values, respectively.
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Buick 455Rev0.lua
(35.98 KiB) Downloaded 220 times
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Slim Jim

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Post Thu Feb 26, 2015 4:43 am

Re: Want to Build Buick 455. Help Please

Good effort, but you can't really compare gross horsepower numbers with net horsepower. I usually take about 80-85% of gross to find the equivalent net ratings and build from there.
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nialloftara

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Post Thu Feb 26, 2015 5:15 am

Re: Want to Build Buick 455. Help Please

Well if you put on a race intake, removed the mufflers and added long tube headers that would give you a fairly close gross HP, just be sure to allow some octane leeway for when you add all the equipment back on.
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ThatSupraGuy9801

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Post Thu Feb 26, 2015 2:09 pm

Re: Want to Build Buick 455. Help Please

Sayonara wrote:I took a stab at it. Power and torque peak at the right RPMs but are slightly higher and lower than the actual values, respectively.


this is great just what I was looking to do. thanks for giving it a try.

also if I ever post a list of copies I have I will credit you next to the 455
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Sayonara

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Post Thu Feb 26, 2015 10:01 pm

Re: Want to Build Buick 455. Help Please

Slim Jim wrote:Good effort, but you can't really compare gross horsepower numbers with net horsepower. I usually take about 80-85% of gross to find the equivalent net ratings and build from there.


I just built to the number I was given. I don't even know what cars this engine powered (and truthfully, I don't really care - my interest in American cars is limited to Corvettes).

@ThatSupraGuy: If you ever manage a 7M-GTE in Group A trim I'd like to take a look at it.
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ThatSupraGuy9801

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Post Thu Feb 26, 2015 10:53 pm

Re: Want to Build Buick 455. Help Please

Sayonara wrote:
Slim Jim wrote:Good effort, but you can't really compare gross horsepower numbers with net horsepower. I usually take about 80-85% of gross to find the equivalent net ratings and build from there.


I just built to the number I was given. I don't even know what cars this engine powered (and truthfully, I don't really care - my interest in American cars is limited to Corvettes).

@ThatSupraGuy: If you ever manage a 7M-GTE in Group A trim I'd like to take a look at it.


I have one but im not sure how completely accurate it is as I have no solid background specs for the group A engine, its good enough for me. I built it off of my 7M which I can tell you is quite accurate. tell me what you think. and im a jap fan too I think they put the 455 in skylarks and other big bodies (as if all American cars from that time aren't) I was doing some reading the other night and came across it was more interested in its specs than what it powered haha. also if you have solid specs for group A 7Ms please share them.
never swapping to JZ,7M for life.
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7M-GTE Turbo ARev0.lua
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Slim Jim

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Post Thu Feb 26, 2015 11:42 pm

Re: Want to Build Buick 455. Help Please

Sayonara wrote:I just built to the number I was given.


I won't argue that - and you did a good job. I was mainly referring to the OP. The reason why it's more difficult to build pre-1972 American engines to exact specs has a lot to do with the difference in ratings. Some of the horsepower/torque ratings were just outright lies. :P If it's realism you're after (and this goes for anyone), you have to take that into account.
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ThatSupraGuy9801

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Post Thu Feb 26, 2015 11:53 pm

Re: Want to Build Buick 455. Help Please

Slim Jim wrote:
Sayonara wrote:I just built to the number I was given.


I won't argue that - and you did a good job. I was mainly referring to the OP. The reason why it's more difficult to build pre-1972 American engines to exact specs has a lot to do with the difference in ratings. Some of the horsepower/torque ratings were just outright lies. :P If it's realism you're after (and this goes for anyone), you have to take that into account.


agreed but the British were guilty as well from what I understand, and I just build to the lies even if it makes it tough, or slightly inaccurate. And I didn't consider that when I posted this thread. Either way it seems its all worked out.
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Corvette6317

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Post Fri Feb 27, 2015 12:32 am

Re: Want to Build Buick 455. Help Please

Here's a recreation I made of the 71 Buick 455 according to the Net ratings of that engine I found on my favorite site for engine specs, http://www.automobile-catalog.com/
Engine.png
Engine.png (828.84 KiB) Viewed 6713 times
1971 Buick 455Rev0.lua
(34.23 KiB) Downloaded 242 times
If you wish to check my source, follow the link and put in "Buick" under Make, "Special-Skylark Mid-Size 3gen; 1968-1972" under Model and "GSX 2-Door Hardtop; 1970-1972" under Sub-model and press "S" on the first 1971 option. Now I can tell you wanted the 1970 version since you wanted 350 Hp but as others have already said, that was a SAE gross rating which isn't the same kind of rating system used in Automation and unfortunately automobile-catalog doesn't have net ratings for that year.
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ThatSupraGuy9801

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Post Fri Feb 27, 2015 12:43 am

Re: Want to Build Buick 455. Help Please

Corvette6317 wrote:Now I can tell you wanted the 1970 version since you wanted 350 Hp but as others have already said, that was a SAE gross rating which isn't the same kind of rating system used in Automation and unfortunately automobile-catalog doesn't have net ratings for that year.
This is why I stick to Toyota for the most part. When did net become the standard? or isn't it?
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Corvette6317

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Post Fri Feb 27, 2015 12:52 am

Re: Want to Build Buick 455. Help Please

American manufacturers started using Net rating in '71 and it became the standard system in '72.
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ThatSupraGuy9801

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Post Fri Feb 27, 2015 12:54 am

Re: Want to Build Buick 455. Help Please

thanks and I checked that site out its very cool ill look at it more later
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