what is different with a "bowtie" block?

[skata]

what excactly is different versus a stock block?
i tried using the search, but no luck.
also, are the syty cranks a regular 4.3 crank?

 

[Thrillhouse]

I know the cranks are the same as standard 4.3's

 

[myclone]

Bow Tie block has:

V8 style oiling system
siamesed cyl bores
blind tapped head bolt holes
wider cam bearing journals for using IL 6 bearings (they are wider)
avail in one or two piece rear main
lifter bosses enlarged to allow offsetting lifters
dry sump but can be converted to wet sump
available with billet main caps
available in aluminum

 

[skata]

myclone,
so when you say siamesed bores, do you mean that there is no water jacket between cylinders right? i assume the cylinder walls are thicker also right?
wider cam bearings: do you still use the same cams? or do you need one with wider journals?
what do you mean by offsetting lifters?
and please dont laugh at me , but what does wet sump and dry sump mean?

 

[myclone]

myclone,
so when you say siamesed bores, do you mean that there is no water jacket between cylinders right?

yes

i assume the cylinder walls are thicker also right?

"...can safely be bored to 4.180" according to GM Perf parts catalog

wider cam bearings: do you still use the same cams? or do you need one with wider journals?

The cam journals are wider to accomodate the .120" wider inline 6 bearings should you choose to use them for extended high RPM durability. You can use either stock width bearings or the wider I6 bearings.

what do you mean by offsetting lifters?
and please dont laugh at me , but what does wet sump and dry sump mean?

Offsetting the lifters can be done two ways. Easiest is to use offset lifters. The other way of doing it is to actually bore the hole for the lifter "off center" of the lifter bore casting. This moves the push rod over to one side to allow large intake ports(notice the intake port in the head is "pinched" where the push rod passes by it?). It also allows the use of the splayed valve head with no worries on the push rod getting in the way.

Wet sump oiling is the stock oiling system(basically). The oil is stored in the pan and the oil pump is driven off the engine internally. A dry sump is diff in the oil pump is external to the engine and is usually driven via a belt off the crank shaft. The oil is stored in a seperate tank instead of in the pan where it gets whipped around by the crank causing drag, foaming, and heating of the oil.

No laughing here.. I wasnt born knowing any of this and had to ask at one time myself.

Some stuff I found by doing a quick browser search under "dry sump oiling". Scroll down to the bottom of the page for explanation of the two by some experts.

http://aolsearch.aol.com/redir.adp?...onent=websearch.google.http.tcl&searchType=MS

 

[Hu Ryde]

In other words. Gooder.

 

[skata]

do any syty'ers use dry sump oiling?

 

[Sy769]

Yes but most of us are to poor or can't justify it. (I'm the first option)

http://www.sportmachines.com/gallery/album37/MVC_008S_001

 

[ghettosled]

actually that pump is whats called a "wet-vac pump". It is basically a single stage external pump, with a built in vacuum pump. It is still a wet sump system, because the oil stays in the pan, but it allows you to run a dry sump block and have externally controlled crankcase pressure (sucks from each valve cover) and adjustable oil pressure. We have been running these style pumps on many of the recent 1000hp bowtie motors.

 

[Sy769]

OOPs :splat: I was thinking you were dry-sump remembered glancing at those pics earlier. That thing is sweet. ::thumbsup::