Author Topic: Questionable "internal" engine modifications.  (Read 32404 times)

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Offline more4les

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Questionable "internal" engine modifications.
« on: June 01, 2015, 12:02:10 pm »
Just for thought. What is considered internal or external? One could argue that behind the shroud is internal. It is inside the outer casing of the engine as delivered. I'm asking because we might have a potential problem within our club on this subject. I don't want to get into specifics but mods done under the covers and shrouds....internal? Also any alteration to a shroud considered external modifications? Removing a shroud considered external modification?

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Offline Darkviper

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Re: Questionable "internal" engine modifications.
« Reply #1 on: June 01, 2015, 12:40:00 pm »
No offense but taking shroud off sounds like a safty hazard. Safty first not to mention a over heating problem.
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Offline berthyd

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Re: Questionable "internal" engine modifications.
« Reply #2 on: June 01, 2015, 01:01:11 pm »
Don't think that's what he's talking about. I would say Lester is thinking about intake manifolds. And I have never seen a definitive answer on it.

Bert
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Offline trbinrat

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Re: Questionable "internal" engine modifications.
« Reply #3 on: June 01, 2015, 03:23:33 pm »
My opinion is if you can see it then it's an external modification.
If it takes away the appearance of a stock looking configuration then it's a external modification.
Mark
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Offline redline

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Re: Questionable "internal" engine modifications.
« Reply #4 on: June 01, 2015, 03:38:25 pm »
What about externally vented carbs and plugged governor shaft holes? Those are visible.
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Offline trbinrat

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Re: Questionable "internal" engine modifications.
« Reply #5 on: June 01, 2015, 04:24:05 pm »
What about externally vented carbs and plugged governor shaft holes? Those are visible.


Ok Ed strike line one that I wrote and go to line Two.

I new someone was going to bring those up. You can add after market air cleaner to that mix too.

It's all in the eyes of the tech man and what he or she will allow.
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Offline redline

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Re: Questionable "internal" engine modifications.
« Reply #6 on: June 01, 2015, 04:36:47 pm »
Mark, just pointing out how much "gray" area there is in this.
If I had my way, it would read original OEM block and cylinder head castings. Period.
Once you start with those, do what you will to them.

Rules state you can change air filter and exhaust. Doesn't say you can trim the cylinder head shrouds to clear the new exhaust, but it's done all the time.
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Offline trbinrat

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Re: Questionable "internal" engine modifications.
« Reply #7 on: June 01, 2015, 06:18:22 pm »
No problems here Ed. I new exactly what you were doing. And agree with you. I have a Intek head on my bench right  now that in no way would pass tech. I did it because I could and wanted to try something different
Mark
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Offline more4les

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Re: Questionable "internal" engine modifications.
« Reply #8 on: June 02, 2015, 09:23:37 am »
How about billet heads that are completely behind a heat shroud?

Lester
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Offline Jim Knutson

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Re: Questionable "internal" engine modifications.
« Reply #9 on: June 02, 2015, 09:28:12 am »
How about billet heads that are completely behind a heat shroud?

Lester
heads are external....period. whats in the heads, that is internal.
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Offline more4les

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Re: Questionable "internal" engine modifications.
« Reply #10 on: June 02, 2015, 11:50:00 pm »
heads are external....period. whats in the heads, that is internal.
Ah but the heads on this particular model are completely behind a heat shield there in making the head internal to the shrouds. I'm 100% with the fact they are an external modification however the point will be made it's internal IF it isn't visible.

Lester
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Offline cycloneracer

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Re: Questionable "internal" engine modifications.
« Reply #11 on: June 03, 2015, 12:14:25 am »
Sounds like your racing with the wrong crew. 



This is suppose to be for fun right???
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Offline George Herrin

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Re: Questionable "internal" engine modifications.
« Reply #12 on: June 03, 2015, 06:30:45 am »
heads are external....period. whats in the heads, that is internal.

In total agreement here.
George Herrin #6
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Offline BIG AL 202

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Re: Questionable "internal" engine modifications.
« Reply #13 on: June 03, 2015, 11:54:40 am »
I HAVE SEEN OHV HEADS THAT THE INTAKE PORT WAS HEAVILY MODIFIED (LOTS OF WELDING). THATS INTERNAL BUT YOU CAN SEE IT, IF YOU LOOK CLOSE ENOUGH. IF THE SIDE OF THE BLOCK HAS A PATCH WELDED ON IT, LIKE A ROD WENT THROUGH IT. MAYBE IT DID AND MAYBE IT DIDN'T. ALL I ASK IS THE RULING IS CONSISTANT!
 I DO AGREE WITH ED, START WITH STOCK BLOCK AND HEAD AND GO FROM THERE!
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Offline berthyd

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Re: Questionable "internal" engine modifications.
« Reply #14 on: June 03, 2015, 01:21:07 pm »
We run billet drive belts. They slip like crazy but they look rad, yo!

Bert
Gary Busey and Rick James both used to live in my shop. Redline stole them.