dand86951

Does anyone have the brand name and where you can buy Engine grout that is compatible with our Alusil blocks?

Russ Murphy

I sure hope that Moroso's engine grout is compatible, seeing as rage2 just poured a bunch of it into his Alusil block. <img border="0" title="" alt="[Wink]" src="wink.gif" />

m42racer

I have followed several posts regarding this grouting of our engines. I'm totally confused about this. Would some one post why this is done. I just don't understand the thinking behind this. Yes I know we have open deck engines, but aren't our cylinder spigots attached at the lower part of the block. If the cylinder spigot moves, would it not move at the top, where its unsupported. Is this not the reason for the deck plate? All I can see happening here is filling up the water jacketing, and lowering the cooling ability. The deck plate seems to me to be the proper solution here. Support the top and no decreasing of water jacketing. Hey, engineering by "Ready Mix"

Mike B

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Russ Murphy:
<strong>I sure hope that Moroso's engine grout is compatible, seeing as rage2 just poured a bunch of it into his Alusil block. <img border="0" title="" alt="[Wink]" src="wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Gotta pipe in here...I don't know squat about types of engine grouts but do know that Rage2 didn't go down to the local cement factory and pick up a bag of their "best"...

The guy working with Rage knows more about Porsches than most of us would ever hope too...

This will be an engine we will all lust after...My opinion of course.

Danno

"If the cylinder spigot moves, would it not move at the top, where its unsupported. Is this not the reason for the deck plate? All I can see happening here is filling up the water jacketing, and lowering the cooling ability. The deck plate seems to me to be the proper solution here."

Yes, that's correct logic. Imagine looking at the cylinders from the side. They have a certain height off the base like a skyscraper. The taller the cantilever arm, the more flexible it is given the same load at the top (like wind). One way to reduce the lateral displacement is to make the height shorter.

Cooling capability is not hindered since most of the heat occur in the top 20-30% of the cylinder anyway. By the time the piston reaches BDC, the gas has cooled tremendously through expansion (pv=nrt) and its kinetic energy converted into mechanical motion by pushing the piston downwards.

It's best to do both deck-bracing and grouting to stiffen the block as much as possible. These are similar to the mods Porsche did in upgrading to the 3.0L blocks. Or we can do it retroactively to the earlier block: <a href="http://www.928sg.com/block.htm" target="_blank">http://www.928sg.com/block.htm</a>

m42racer

I think so too. I might add if I can, that the total volume of water available to transfer the heat into, will have an effect on overall cooling. It has been discussed here earlier about the pressure internally required also. Not the coolant system pressure, but rather the pressure in the block and head. If I may also add, the biggest problem with open deck engines is the dynamic pressure not heat. Also, most of the heat transferred to the cylinder walls comes from the rings. By the time the Piston reaches the bottom of the cylinder, alot of the heat has transferred from the Piston crown thro' the rings and into the cylinder walls. Engine RPM will control the time/transfer factor. Not sure about your theory on the bending been controlled by shortening the height. I can see this having some effect on Cast Iron blocks, but the M of E of cast aluminum seems to show that bending will still occur unless its held at the top.