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Fuel?
- Thread starter jon2
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I don't beleive there is a fuel out there, that builds compression for your engine. In another post regarding a sirio .18, a gentlemen asked about how compression on his engine, and taking the gasket out etc. I told him to send his engine to OSRocket, he has a method called pinching to increase an engines compression. All the guys on the UE forum swear by it. Just my .02
Woody :madface:
Woody :madface:
El Pirata
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Bill Hoskinson
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Jon,
Fuel's with higher oil contents will help build compression.
IMO, some people don't fully understand how to tune thier engine, and instead of tuning the engine to the fuel they have, they sometimes change fuels to find one that works with the needle settings, and glow plug they already have. More often than not, these people will find their truck starts, and stays running better on low oil content fuels.
Fuels with oil content between 14-16% make more torque and low end power than low oil content fuels in the 8-12% range when propperly tuned.
For 2 reasons-
First, anytime you trap a higher percentage of oil in the combustion chamber, you affectively decrease the available space for air to compress within the combustion chamber.
Second- The engines we have in our trucks do not have compression rings, so they rely on a tight fit between the piston and sleeve to build compression. Additional oil in your fuel will help seal the gap between the piston and sleeve.
The thing about running higher oil content fuels is that they are a little harder to tune, in that your engine will take longer to warm up, and "flame outs" tend to happen more frequently when running light weight flywheels, or cold glow plugs.
When using high oil content fuels, a glow plug with a warmer heat range may be needed.
I don't use fuel's with less than 14% oil content.
Fuel's with higher oil contents will help build compression.
IMO, some people don't fully understand how to tune thier engine, and instead of tuning the engine to the fuel they have, they sometimes change fuels to find one that works with the needle settings, and glow plug they already have. More often than not, these people will find their truck starts, and stays running better on low oil content fuels.
Fuels with oil content between 14-16% make more torque and low end power than low oil content fuels in the 8-12% range when propperly tuned.
For 2 reasons-
First, anytime you trap a higher percentage of oil in the combustion chamber, you affectively decrease the available space for air to compress within the combustion chamber.
Second- The engines we have in our trucks do not have compression rings, so they rely on a tight fit between the piston and sleeve to build compression. Additional oil in your fuel will help seal the gap between the piston and sleeve.
The thing about running higher oil content fuels is that they are a little harder to tune, in that your engine will take longer to warm up, and "flame outs" tend to happen more frequently when running light weight flywheels, or cold glow plugs.
When using high oil content fuels, a glow plug with a warmer heat range may be needed.
I don't use fuel's with less than 14% oil content.
So, trinty horespower 12% oil may be doing good for me.
BUT if I were to use a different blend with more than 14% oil I would
Get a hotter plug, take more time to warm up, and tune.
he I would maybe noticee a bit more low end, and compression?
I want to get this straight, and run fuel that is both good for my motor, and makes nice power.
I also want to get some decent plug suggestions. I am tired of them being behind the counter, and having to argue with the LHS guy about wanting more than one heat range.
BUT if I were to use a different blend with more than 14% oil I would
Get a hotter plug, take more time to warm up, and tune.
he I would maybe noticee a bit more low end, and compression?
I want to get this straight, and run fuel that is both good for my motor, and makes nice power.
I also want to get some decent plug suggestions. I am tired of them being behind the counter, and having to argue with the LHS guy about wanting more than one heat range.
Bill Hoskinson
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I run Duratrax Silver Sport plugs in everything. They are a replacement for the McCoy MC-59. They are a "hot" plug. I would only recommend a hot plug to be used with 20% Nitro or less.
At 25% Nitro, you may need to look at going to one step colder plug, at at 30% maybee even one step colder.
Engines that are starting to lose "pinch" in the piston and sleeve will show signs of better performance with higher oil content fuels.
Like I said, I don't run anything less than 14%.
Different Lube packages come into play here also, but that is another topic alltogether.
If you want to expierement, make one change at a time. But one thing you cannot do with high oil content is "tune for smoke".
Your engine will smoke even after you have gotten it too lean due to all the oil in the fuel. Tune it for power first, and temp second.
Generally, small blocks run between 250-275, and big blocks run good between 180-250.
At 25% Nitro, you may need to look at going to one step colder plug, at at 30% maybee even one step colder.
Engines that are starting to lose "pinch" in the piston and sleeve will show signs of better performance with higher oil content fuels.
Like I said, I don't run anything less than 14%.
Different Lube packages come into play here also, but that is another topic alltogether.
If you want to expierement, make one change at a time. But one thing you cannot do with high oil content is "tune for smoke".
Your engine will smoke even after you have gotten it too lean due to all the oil in the fuel. Tune it for power first, and temp second.
Generally, small blocks run between 250-275, and big blocks run good between 180-250.