Mullins Racing Engines

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big swigg

Active Member
I see that they have a pump gas motor now.. I seen Dean Hoffman, Matt Mevert & Chad Kinder are running them... Is this going to be the new thing?? Less expensive?? Anyone know anything about these??
 
"Maybe" less expensive to operate until the boutique blend of fuel comes out for them. Couldn't see the initial purchase price being less though.
 
More expensive up front. Lower cost on fuel and motor is supposed to last longer.

Mullins builds the best
 
The biggest challenge with an engine build like this is being able to keep the EGT and coolant temperatures in check. Other than that it wouldn't be that difficult. There is no magic when it comes to engines.
 
I was wondering about heat, but after reading the article there seems to not be a lot of compression so that will help..
 
No, not having a lot of compression will hurt when it comes to reducing heat and especially EGT's. the good thing is that it doesn't have to be really low say 9:1 due to some rule so that's also very helpful.
 
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I've heard lower comp. Meanns hotter. Some fuel is left burning in the cylinder, instead of being forced out. Advancing the timing helps with this issue and with coolant temps.
 
Lower compression tends to make the engine less efficient and the burn rate can be slower. What is weird is that the timing requirement is not necessarily higher and advancing the timing more doesn't generally help and usually just hurts torque and horsepower. This is especially true if the camshaft is not optimum and has an exhaust opening event that's too early and or the induction is also restricted.
 
f40 said:
i am sure mullins has done their homework
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I'm sure they have but if braking and drivability are easily improved by running lower compression wouldn't an easier solution be to just simply add some inertia to the engine assembly to slow the transient response instead? Of course you would still have to run racing gas.
 
DaveMcLain said:
I'm sure they have but if braking and drivability are easily improved by running lower compression wouldn't an easier solution be to just simply add some inertia to the engine assembly to slow the transient response instead? Of course you would still have to run racing gas.
Click to expand...

Sounds like they have it figured out.Thinking out loud here, but adding inertia would slow deceleration, but also slow acceleration.
 
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