Opinions. Is the original engine air intake sufficient for a 8v92 500 hp seems small to me or not?
You could add an air restriction gauge between filter and air inlet to check. They don't cost much.
Those are large enough it sucks air from both sides and 8v92TA only needs 300 cfm more air
Thanks for the info.
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?
I have to guess the 12.7L!
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
2 stroke vs. 4 stroke
Volume CI or Litre
RPMs
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.
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
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
So will the 1968 oem air filter allow the correct cfm for the 8v92?
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
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.
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
Quote from: luvrbus on 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
Yes, my s60 only has 340k miles but has no paint left on the engine block. I'm assuming from the confined engine bay holding a lot of heat.
Quote from: luvrbus on 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
Hmmm, I have been told that the 8V71TA engine on my bus can be cranked up to 400HP by changing the cams, 80 series injectors and a larger turbo.
It's something something that I am considering; only problem is that on my Prevost you have to yank the engine in order to change the cams.
Quote from: freds on May 13, 2021, 09:47:02 AM
Hmmm, I have been told that the 8V71TA engine on my bus can be cranked up to 400HP by changing the cams, 80 series injectors and a larger turbo.
It's something something that I am considering; only problem is that on my Prevost you have to yank the engine in order to change the cams.
You can get 450 hp out of 8v71 but their life is short too and heat goes with HP increases not only do you pull the the heads need to removed to change cams not worth the work and money involved for 50 more hp going from 350 hp IMO
better to change a 400hp 8v92.
Quote from: tr206 on May 13, 2021, 04:30:00 AM
So will the 1968 oem air filter allow the correct cfm for the 8v92?
If your setup draws air from both sides, then you have enough intake capacity, but you may need to upgrade the air filter to make sure you have up to 1500 cfm.
What is the filter upgrade #, it's got a 42125 wix which has 995 cfm now.
Quote from: tr206 on May 14, 2021, 04:31:12 PM
What is the filter upgrade #, it's got a 42125 wix which has 995 cfm now.
Use the ECO system and forget about it the 995 cfm is a N/A 8v71 cfm rating
OK. Is that the ECOLITE by Racor?