Ring end gaps
02-23-2015, 02:23 PM
#32
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Yes Mild... think about it... when you have lets say a 454 with a bore of 4.310 for eg, the cylinder wall thickness (thinner) will have a significant effect on (friction surface temp) the wall's ability to cool... as opposed to lets say a dart/merlin 4.500 bore (thicker sleeve) temp is stable all around the bore and cools evenly and effectively... if I'm understanding your statement correctly???
02-23-2015, 02:39 PM
#35
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It's not the block that gets the steam pockets it's the head. I've tested back to back dumping water out the back of the intake/ blocked off. Absolutely no difference in temp either way. This was with a Dart block. After thinking about it I would have to say that if you pull water from the back of the intake (create a short circuit in the cooling system) it would be more prone to getting steam pockets in the head than if it was blocked off. I can tell you this from experimenting that introducing cold water to the back of the intake drastically reduces detonation. If you look at some of the high dollar cylinder heads out there now they have a manifold made into the back of the head...
02-23-2015, 02:50 PM
#36
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I don't run any water thermostats. My water temp coming out of my block is never more than 110*. Water going in is between 60-70 deg.
I used to run water dumps off the rear off my intakes when I had 250 blowers. When I switched to the 420 blowers I didn't drill and tap the intakes. I've been running it that way for about 100 hours now with no issues.
I used to run water dumps off the rear off my intakes when I had 250 blowers. When I switched to the 420 blowers I didn't drill and tap the intakes. I've been running it that way for about 100 hours now with no issues.
02-23-2015, 02:52 PM
#37
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If I was only doing the top end and didn't have the engine out of the boat, I'd probably be going that direction myself. It just makes sense to me to do it since it's all apart. Just my take on it though.
02-23-2015, 02:54 PM
#38
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Tom,
Understood. My question was intended to determine the temperature differential, from max to min, in various areas of the block. Based on that information, running an open bore block, seeing potential 60 º min. water temp and a max bore coolant temp of 160º, I would suggest you open the gaps from .003"-.004" to compensate for the lowest internal temp.
The concept of thermal stabilization is a worthwhile conversation (for another thread), however i do not want to derail your inquiry for a viable answer to your question.
Bob
Understood. My question was intended to determine the temperature differential, from max to min, in various areas of the block. Based on that information, running an open bore block, seeing potential 60 º min. water temp and a max bore coolant temp of 160º, I would suggest you open the gaps from .003"-.004" to compensate for the lowest internal temp.
The concept of thermal stabilization is a worthwhile conversation (for another thread), however i do not want to derail your inquiry for a viable answer to your question.
Bob
02-24-2015, 07:16 AM
#39
STD 454 block isn't likely to steam pocket around the rear, however bleeding a small potion off still helps even out the overall temp front to rear just my opinion... and we all know what that means!! there's another azzhole on the board!! lmfao
