Mad Mackie
Lawn Addict
- Joined
- Jul 11, 2011
- Threads
- 50
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- 1,851
Hi KennyV,
I think by that time that I had started using 89 in my Onans, don't recall. I did eventually go to 91 for use in my Onans and two strokes. Engines with fixed high speed jets are run so lean due to emission demands that they run hotter than older engines with adjustable jets. I noticed this on my Ingersoll 448 when I repowered it in 1996 from a B series Onan to a P series Onan. I was using my infrared temp gun and noticed a dramatic increase in muffler temps. The B series Onan was developing too much blowby so I replaced it. I bought this tractor used with a nonfunctional hourmeter that stopped at 1,000 hours. Case and Ingersoll both used K series Kohlers and most of the folks that still operate them have increased the octane of the fuel they use.
All my Briggs engines run fine on 87 so that is what they get, but I still have the 91 in my trailer for the two strokes and my Stihl FourMix engines.
Mad Mackie in CT
I think by that time that I had started using 89 in my Onans, don't recall. I did eventually go to 91 for use in my Onans and two strokes. Engines with fixed high speed jets are run so lean due to emission demands that they run hotter than older engines with adjustable jets. I noticed this on my Ingersoll 448 when I repowered it in 1996 from a B series Onan to a P series Onan. I was using my infrared temp gun and noticed a dramatic increase in muffler temps. The B series Onan was developing too much blowby so I replaced it. I bought this tractor used with a nonfunctional hourmeter that stopped at 1,000 hours. Case and Ingersoll both used K series Kohlers and most of the folks that still operate them have increased the octane of the fuel they use.
All my Briggs engines run fine on 87 so that is what they get, but I still have the 91 in my trailer for the two strokes and my Stihl FourMix engines.
Mad Mackie in CT