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Originally Posted by 4bus
(Post 4175220)
IR temp gun, and knock sensor monitoring show no difference in the 3.5 in pulley to the 3.25 (6-8lbs). I am approaching 100 hrs with this set up, based off data I collected, not what I "heard".
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It is safe to say a hotter plug is better. Un burned fuel will cuase fouling and inburnt fuel at higher rpms. But that is just what I have heard
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Originally Posted by mcprodesign
(Post 4175356)
that explanes why your blowers sound a little dufferent as far as the rpm sound. Sounds like your motors are turning tons of rpms. But uts just your blowers spinning faster.
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Originally Posted by mcprodesign
(Post 4175361)
It is safe to say a hotter plug is better. Un burned fuel will cuase fouling and inburnt fuel at higher rpms. But that is just what I have heard
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No i am not trying to get under your skn. My boat spins 5800 too but the rpm of the blower is different cause i have 3.5s. Just sounds different. My pistons look like brand new after 142 hours w yr5s. Stock 575 engines w intercoolers and msds
Originally Posted by 4bus
(Post 4175433)
Engines spin at 5800+, so it's not just the blowers. Are you just trying to get under my skin?
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You can take any motor from any car and go 1 heat range higher and it wont hurt it. In the old days we did it to help the engine use less oil. Yea thats right . One heat range hotter actually cuts down on burning oil in some cases. I tried a set R5673 8s in one hour of use it fouled plugs. I guess my electronics and stuff are flowed for lots of fuel . My motors are stock though
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Originally Posted by 1 MAIDEN AMERICA
(Post 4175027)
Port and Star engines were getting to 5-7 gallons off on fill ups so I sent the injectors in. One would go max flow as soon as he started raising the pulse width. Another one dribbled a bit at idle, dirty, the rest were a little low on flow, dirty. Four years later, same thing. He said the Merc/Chev injectors are crazy expensive so he got some from a Volvo? Something like that. There's a slightly different ohm/impedance?, can't remember, but when run side by side with the other injectors they flow the same.
Other than the consumption discrepancy I didn't notice anything running. The engines are slightly fat at idle but no soot build up, just a stumble off idle, be it 5 minute idle or an hour, trying to get on plane that clears up before I'm on plane. Then, to clean the plugs, I hammer the limiters. Mercs system kills fuel so it works great! Haha kidding, stupid limiter design. |
Originally Posted by 4bus
(Post 4175434)
It's safe to say that? Says who? A hot plug is also a great way to burn a hole in the top of a piston of a supercharged engine that already makes higher egts than n/a. Maybe you should stick to sanding bottoms, rather than telling people that a plug 4 heat ranges hotter is safer. Unburied fuel should be handled with proper fuel air management, not with a plug hotter than then surface of the sun.
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MCPRODESIGN - I disagree. The motor will tell you what heat range it wants. Not a catalog nor just sayying 1 hot range hotter than stock no matter what.
There's more to it than that. |
Originally Posted by SB
(Post 4175746)
MCPRODESIGN - I disagree. The motor will tell you what heat range it wants. Not a catalog nor just sayying 1 hot range hotter than stock no matter what.
There's more to it than that. But back to this discusion. Merc 575s sci's will live for years with Hotter plugs. Is a 250 blower really that much more than a na motor. Only the heat when you crank them up. A 250 is a supercharger but a pretty weak one. Now if i put a 671 on it. That would be serious blower. But i heard they dont make as much heat. |
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