Half filled hard block 400 sbc cooling issues - Chevy Nova Forum
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Old 27th-January-2008, 09:09 PM   #1
Ironman
 
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Half filled hard block 400 sbc cooling issues

Has anyone done a half fill on their 400 small block and ran it on the street? Any cooling problems? Har far did you fill it with hard block?
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Old 27th-January-2008, 09:21 PM   #2
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Ran a Camaro like that with no cooling problems at all. Don't recall exactly how full it was, but I believe it was up to the welch plug.
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Old 27th-January-2008, 09:23 PM   #3
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I did it before I had the block bored and decked, filled right to the bottom of the freeze plug. No cooling problems because the heat is generated in the head (Dart Pro 1 Aluminum) and upper portion of the cylinder. Run 185-190, got it to 200 once at a cruise. Use a 4 core Desert Cooler and a 2200 cfm electric Flexlite fan
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Old 27th-January-2008, 09:30 PM   #4
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As Mike said, I have filled quite a few that saw some limited street use, not a "normal" everyday type of car, and I have not seen any significant issues.


I would think the oil temps would increase and the piston and/or cyl temps would increase as well, so I would possibly keep that in mind in regard to application and tuning, if it were me.




Good luck

Jeff
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Old 27th-January-2008, 10:03 PM   #5
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Great, thanks for the responses guys.
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Old 27th-January-2008, 10:08 PM   #6
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Quote:
Originally Posted by stock z/28 View Post
As Mike said, I have filled quite a few that saw some limited street use, not a "normal" everyday type of car, and I have not seen any significant issues.


I would think the oil temps would increase and the piston and/or cyl temps would increase as well, so I would possibly keep that in mind in regard to application and tuning, if it were me.




Good luck

Jeff

You beat me too it. My block is filled to the bottom of water pump passages and it too rans 180 all day long. Just dont look at the oil temp gauge! Temps will for sure increase even if you half fill with hard-block.
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Old 27th-January-2008, 11:58 PM   #7
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Engine 101 student here. Why does it cause the oil temps to rise?
Ron
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Old 28th-January-2008, 12:04 AM   #8
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Engine 101 student here. Why does it cause the oil temps to rise?
Ron
Because the bottom half of all your water passages are blocked and thats where all the oil is the bottom half of the block or most of it anyways. So there is no heat transfer from the oil to the water.
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Old 28th-January-2008, 12:10 AM   #9
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Thanks for the answer! I was thinking that the oil picked up most of it's heat from rocker arms and valve springs.....top of the engine stuff. I learn something new everytime I log on here at Steves.
Ron
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Old 28th-January-2008, 12:22 AM   #10
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Thumbs up Half Filled hard block 400 sbc cooling issues?

Hey Now. I have done this for years. The engine runs cooler because the coolant is only going to the Hot part of the block and heads. Heat is generated in the upper portion of your engine, not the lower part. As for oil temps. Mine were cooler, by 22 degrees at gage reading. Note that engine oil also helps cool your engine. Also this does help strenghthing the area around the main webs. Engine temps 190 with 180 thermostat. Ambient temps. 110 to 118. This also includes city and country driving, with auto trans. Fill to the bottom of the freeze/welch plugs an the side of the block. Note I run a destroked 400 = 377 ci. Respectfully, "Bill's" II
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Old 28th-January-2008, 12:23 AM   #11
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Quote:
Originally Posted by 62civa View Post
Engine 101 student here. Why does it cause the oil temps to rise?
Ron
Well Im certainly no expert and am not offering to teach anything, but I will give you my perspective.

Its a bit different than cr74hbs but he may be right.


In my opinion when you partially fill the cooling jacket you obviously decrease the contact area the coolant has with the cyl walls. I agree that the vast majority of the heat is generated and absorbed in the head and the top of the cyl, but the lower cyl wall is also dissipating piston heat through transfer from the piston/ring to the wall. With the jacket filled that part of piston cooling is lost and (in my opinion) causes an increase in piston temps (especially under severe load). Since the inside of the piston as well as the lower skirt are exposed to quite a bit of both directed and splash oil flow there is quite a bit of heat transferred to the oil.


It seems that with proper adjustments to tuning the increased piston temp is capable of producing a bit more power in some cases.

That along with the stiffening of the cyl wall (better ring seal) is probably worth a significant power increase.

My only concern is that at times the filler will shrink, possibly unloading the cyl wall.

Remember this is just my thoughts and probably not close to correct, but I would appreciate your thoughts on this.

I just find this an interesting topic.



Jeff
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Old 28th-January-2008, 01:22 AM   #12
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what does it mean to fill the block?
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Old 28th-January-2008, 11:03 AM   #13
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To a point, higher oil temp is not necessarily a bad thing. Higher oil temp often will result in increased power.
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Old 28th-January-2008, 12:47 PM   #14
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HHMM David Vizard states Lower oil temps as a result of Half filling a block.
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Old 28th-January-2008, 02:02 PM   #15
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filling a block

Quote:
Originally Posted by youngin69nova View Post
what does it mean to fill the block?
Filling a block is when you use a concrete like substance fill, that you pour into the water jacket of your motor.
The idea is to strengthen your block from the inside.
One of the main benefits is to control bore flexing.
Most people do two different types of fill.
1. Street fill-you fill up to the bottom of the lower freeze plugs.
2. Race fill- you fill to the bottom of your water pump holes.
All fills should be done "Before" you do your machine work.
Just a short version, I'm sure someone out there can explain it better than me.
Hope this helps. Mike

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