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Hey guys im always trolling this section, its a great source of info.
I have a engine apart now and wanting to do this mod to the rotor housing. My question is after looking at numerous pics that I found, all the grooves are around (circular) the inside of the coolant passage against the flow. Why wouldnt you cut the grooves to run with the flow of coolant and taper back out before the edge where the irons meet? Or does the other way not disturb the flow that much? Thanks |
Originally Posted by T04Rx-7' date='Feb 16 2005, 09:18 PM
Hey guys im always trolling this section, its a great source of info.
I have a engine apart now and wanting to do this mod to the rotor housing. My question is after looking at numerous pics that I found, all the grooves are around (circular) the inside of the coolant passage against the flow. Why wouldnt you cut the grooves to run with the flow of coolant and taper back out before the edge where the irons meet? Or does the other way not disturb the flow that much? Thanks The grooves are that way because you can program a mill to do it, and then hire a high school kid to run it for hours at little cost. Another point is that turbulance is good. one problem in cooling systems is that a boundry layer of heated coolant forms on the surface of the metal and insulates the coolant above the surface from that heat. Look at an expensive exchanger vice a cheap one. The tubes of the expensive cooler have dents at opposing angles. The cheap cooler has smooth tubes. The dents create turbulance that keeps scrubing off that boundry layer, and thus exchange more heat for a givin area. Same inside the engine. Not only cheaper than broaching the grooves in line with flow, it also works better. The turbulance is not a flow factor, as the pump has huge excess capacity at higher revs. Lynn E. Hanover |
Any one have any pictures of this?
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Originally Posted by Lynn E. Hanover' date='Feb 16 2005, 10:26 PM
The grooves are that way because you can program a mill to do it, and then hire a high school kid to run it for hours at little cost.
Another point is that turbulance is good. one problem in cooling systems is that a boundry layer of heated coolant forms on the surface of the metal and insulates the coolant above the surface from that heat. Look at an expensive exchanger vice a cheap one. The tubes of the expensive cooler have dents at opposing angles. The cheap cooler has smooth tubes. The dents create turbulance that keeps scrubing off that boundry layer, and thus exchange more heat for a givin area. Same inside the engine. Not only cheaper than broaching the grooves in line with flow, it also works better. The turbulance is not a flow factor, as the pump has huge excess capacity at higher revs. Lynn E. Hanover Lynn what is your take on grinding extra grooves around the back of the spark-plug holes area inside the coolant passages? I read that this is the hottest area around spark plugs. thank you sir. |
Run a Good Quality radiator, Proper shrouding,quality coolant, and the proer thermosat and hoses and you will alleviate most of your trouble. Most cooling problems I have seen were caused by "performance enhancements" IE Poory thought out E-Fan installs, leaving off the drip tray etc.
I have been please with Evans NPG+ as my coolant of choice |
Originally Posted by Lynn E. Hanover' date='Feb 16 2005, 10:26 PM
The grooves are that way because you can program a mill to do it, and then hire a high school kid to run it for hours at little cost.
Another point is that turbulance is good. one problem in cooling systems is that a boundry layer of heated coolant forms on the surface of the metal and insulates the coolant above the surface from that heat. Look at an expensive exchanger vice a cheap one. The tubes of the expensive cooler have dents at opposing angles. The cheap cooler has smooth tubes. The dents create turbulance that keeps scrubing off that boundry layer, and thus exchange more heat for a givin area. Same inside the engine. Not only cheaper than broaching the grooves in line with flow, it also works better. The turbulance is not a flow factor, as the pump has huge excess capacity at higher revs. Lynn E. Hanover Sounds good in theory, but I'd like some practical before & after data that substantiates that it's actually worth something to do this. B |
This is the only type I have found. Its done by Racing Beat.
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