engine covers???

[bkrider113]

hey all, I was playing with my kart the other day and started taking off what seemed to me as heat shields for safety?? Now that I look at it im wondering if those are there so currents from the flywheel flow up to cool the head. So my questions are...Will the engine run hotter if I remove these. They are cheap little plates on the top of head and side. Does anyone run with no blower housing or is that just stupid?

 

[Russ2251]

Will the engine run hotter if I remove these. They are cheap little plates on the top of head and side. Does anyone run with no blower housing or is that just stupid?

Yes.
Why would you want to run hotter?
Heat=Power Loss
What we use (for the most part) are NOT "free air" engines. They depend on forced air flow.

 

[Kenny_McCormic]

Its called a fan cooled engine for a reason.

 

[mike75925]

how hot do these motors need to run? how hot do the built motors get? on a built motor, are these 'enclosures' modified for the higher rpm, or is that why the fly screens have so small of holes?

 

[Russ2251]

how hot do these motors need to run? how hot do the built motors get?

Hot enough to vaporize fuel/air mix, but not hot enough to detonate (knock). A pretty wide margin.
So called "cheap little plates" are called cylinder shields and provide for uniform cooling/heating around cylinder/head and are not for operator protection.
Why some folks decide to remove them is beyond my understanding of what it is they are trying to accomplish. Weight loss? Looks cool?
This stuff is not designed for S&G's, but instead serves a purpose.
Change/modify anything and expect to pay the price.

 

[mike75925]

yep, use at your own risk. i was asking from a stand point of higher rpm=more air but also more rpm = heat. just like porting a head, is ther a point at which one needs to 'port' his cooling air?

 

[jr dragster T]

how hot do these motors need to run? how hot do the built motors get? on a built motor, are these 'enclosures' modified for the higher rpm, or is that why the fly screens have so small of holes?

Typical head temperatures on a built up briggs on gas is around 380-400 F?
Typical head temperature for a blockzilla or equivilant on alcohol at the top end is around 300 F
On cold days some guys tape up the holes on the scatter shield for more heat and remove tape for less heat.