ls1290

iTrader: (20)

I know that water jacket will help prevent cylinder wall flex and give extra support, but how does it affect the overall cooling system? Since the water jackets are filled with materail, would the car end up running hotter? Would the car be limited to running "short" durations? Would adding a better OEM water pump help over come the difference in flow rate because of the filler? TIA

NoGo

iTrader: (2)

Not an engine expert:

I am curious as to why you want to pour the jackets. I thought this was something that you did on **** blocks, or if you were concerned with punching through when clearencing for a stroker crank?
I would advise against it, solely because most fillers that I know of are designed to meet the same rate of expansion as cast iron. Our blocks being aluminuminuminuminum naturally has a different rate of expansion, and I doubt would work. I don't know of an engine filler for aluminum blocks, but as stated above.....I am not an engine expert. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

ls1290

iTrader: (20)

I was/am thinking about this on a iron( LQ4 ) block with a bore of 4.160". With the bore pushed to the limits of the new sleeves, I thought that filling the water jackets would help. I now that one Top Fuel, Funny Cars, and most Pro Mods that the blocks are filled.

Skelton

We use to do this on old windsor blocks back when thier wasn't any cheap aftermarket blocks. We would only fill the bottom half of the motor for bottom end rigity if it was going to see limited street racing use. It really does keep block flex to a minimum which makes the block alot stronger. They were nominal for street use and on hot days they would get too hot. Still saw quite a few 5 second 1/8 mile passes on stock blocks.

joghotrod

I filled the water jackets of a 400 cu. in. sbc up to the water pump holes with block filler and it works great. But this in a drag race only car. I think if you only filled it half way and used synthetic oil and a oil cooler you could probably get away with it. Most of the heat is made in the head area so monitor your water and oil temp. often. Have fun, Jimmy

ls1290

iTrader: (20)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by joghotrod:
<strong> I think if you only filled it half way and used synthetic oil and a oil cooler you could probably get away with it. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Will filling it half way give the cylinder wall that much more support? I guess I am asking is which part of the cylinder is more prone to flex; the upper or lower?

LS1derfull

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NoGo:
<strong>Not an engine expert:

I am curious as to why you want to pour the jackets. I thought this was something that you did on **** blocks, or if you were concerned with punching through when clearencing for a stroker crank?
I would advise against it, solely because most fillers that I know of are designed to meet the same rate of expansion as cast iron. Our blocks being aluminuminuminuminum naturally has a different rate of expansion, and I doubt would work. I don't know of an engine filler for aluminum blocks, but as stated above.....I am not an engine expert. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Dont sell your self short, you sure sound like you know whats up. In iron block filler would bridge and strengthen sleeves to each other, temperature increase would occur because of reduced coolant capacity, but this could be adjusted with bigger radiator capacity. Upper area of bore is where heat is generated and filler would heat up lower area of block but this would have end result of stronger more reliable block since temperature gradient across block would be reduced. Win win situation except for extra weight added to nose of vehicle. LS1 motor doesnt have bore distortion of old school type motors so no reason to do this mod other than strengthen big bore sleeve application. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

LS1derfull

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by ls1290:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by joghotrod:
<strong> I think if you only filled it half way and used synthetic oil and a oil cooler you could probably get away with it. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Will filling it half way give the cylinder wall that much more support? I guess I am asking is which part of the cylinder is more prone to flex; the upper or lower?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The upper is more prone to flex but lower area support will affect upper area stability. The reason cylinder flex is a problem is it can cause ring end gap butting or ring flutter which is loss of seal and or power.

ls1290

iTrader: (20)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LS1derfull:
<strong>LS1 motor doesnt have bore distortion of old school type motors so no reason to do this mod other than strengthen big bore sleeve application. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">So you think that filling the water jacket one a LQ4 block with a bore of 4.160" would do little or no help? Just wondering since a bore that big leaves little left in the sleeve lining and resleeving the block leaves little room between cylinders.

<small>[ July 29, 2002, 05:32 PM: Message edited by: ls1290 ]</small>

LS1derfull

I think it would be benifical, but how thin is 4.160" sleeve when finished?
Hard block filler would help situation any way you look at it.