1968 eagle original air intake side vents

tr206 · May 11, 2021, 05:41:21 AM

Opinions. Is the original engine air intake sufficient for a 8v92 500 hp seems small to me or not?

chessie4905 · May 11, 2021, 07:08:26 AM

You could add an air restriction gauge between filter and air inlet to check. They don't cost much.

luvrbus · May 11, 2021, 07:57:47 AM

Those are large enough it sucks air from both sides and 8v92TA only needs 300 cfm more air

tr206 · May 12, 2021, 03:57:36 AM

Thanks for the info.

DoubleEagle · May 12, 2021, 07:02:55 AM

My Model 15 with a Series 60 only sucks from one side, but then it is a four cycle. It raises a question, which engine requires more intake air volume, a 8V92 @500 hp, or a 12.7 Series 60 @ 470 hp?

dtcerrato · May 12, 2021, 08:33:44 AM

I have to guess the 12.7L!

luvrbus · May 12, 2021, 08:37:18 AM

Quote from: dtcerrato on May 12, 2021, 08:33:44 AM
I have to guess the 12.7L!

Nope the 8v92TA needs 1300 to 1500 cfm the 12.7 lives good on 900 cfm ,my Cummins ISX 600 only has a 900 cfm air filter

niles500 · May 12, 2021, 09:47:44 AM

2 stroke vs. 4 stroke
Volume CI or Litre
RPMs

DoubleEagle · May 12, 2021, 08:50:38 PM

Well, that's it, the 8V92 sucks, but sounds cool, and the Series 60 gets to the top of the mountain first without generating as much heat.

luvrbus · May 12, 2021, 09:22:21 PM

8v92's weren't bad engines they ruled the world for 20 years LOL there was always a saying the 8v92 never died from natural causes they were always murdered by owners and wrench turners . If you look back DD did not do many upgrades on the 8v92 like was done on the series 60

windtrader · May 12, 2021, 09:55:13 PM

QuoteIf you look back DD did not do many upgrades on the 8v92 like was done on the series 60

That makes sense as one model was the last upgrade of the line and the other was the first of a new design. If you were to compare a Series 60 model produced after 10 years, if such did occur, I'd bet that motor was as solid as the 8v92. Just curious if the hunch as any merit. lol

tr206 · May 13, 2021, 04:30:00 AM

So will the 1968 oem air filter allow the correct cfm for the 8v92?

luvrbus · May 13, 2021, 04:48:39 AM

Quote from: windtrader on May 12, 2021, 09:55:13 PM
That makes sense as one model was the last upgrade of the line and the other was the first of a new design. If you were to compare a Series 60 model produced after 10 years, if such did occur, I'd bet that motor was as solid as the 8v92. Just curious if the hunch as any merit. lol

The difference was GM didn't own Detroit Diesel when the series 60 was being upgraded, Roger Penske owned it and kept spending money to make it better GM was gone with the 11.1 series 60,it is a good engine like all good engines the EPA sent it packing to early

chessie4905 · May 13, 2021, 05:43:50 AM

Amazing how many Prevosts are sold with under 100k with "new engine". Guess inexperienced owners didn't know to accasionally check oil level or avoid overheating.

luvrbus · May 13, 2021, 05:59:19 AM

Bus engines have 1/2 the life span of engines in trucks it has a battle with heat with the rear engine and always a battle for fresh clean air ,MCI knew that with the 8v92 ,360 hp to 400 hp was MCI limit on HP with the 8v92 but owners want the HP and pay a price