bobby

what does siamese cylinders mean? and what does wet or dry sump mean, thanks!!!

ho85GT

by what i have read siamese cylinders are connected in some form or another, not sure, so dont hold me to it. trying googling it or ask.com

bobby

ok thanks a lot, anyone else know?

vfast

dry sump means the pump is not in the oil pan but is driven by a belt like a alt.

vfast

here is pics of a 400 sbc which has the siamise cly

[IMG]local://upfiles/1534/DBCD812A4DE24319BB522C843C61F881.jpg[/IMG]


here is one of a 350sbc which is not..can you see the difference?

import slayer

Simesed cylinders do not have coolant passeges between them where a non-simesed block does have coolant passeges.
The advantage is that the block can be bored larger than a non-simesed block.
A simesed bow tie block, like the chevy 400, can be bored to 4.10 inches unlike the non-simesed 350 can only be bored a maximum .060(4.060)

roundman

siamese cylinders means there is no water jacket located between the cylinders, it's solid cast iron which means it is a stronger design. the water jackets only run down the outside and inside of the cylinders, not 360 degrees around them.
and a dry sump engine has an external mounted oil pump belt driven by the engine and a shallow oil pan along with a separate oil tank to hold the engine oil. the multi-stage oil pump scavenges the oil from the pan with a couple of stages in the pump and delivers it to the oil tank from which the pressure stage(s) of the pump get the oil they supply to the engine bearings. the oil tank has special baffling inside to separate the air sucked up by the pumps from the oil before it is pulled out by the pump and supplied to the engine. dry sump systems often contain a large volume of oil, like a couple of gallons, and often include an oil cooler loop to cool the oil also.

import slayer

roundman, you must be typing at the same time I am...LOL

vfast

reason for a dry sump is to cut down on the windage under the car is one of the main pluses

bobby

thanks a lot! i tottaly undertsnd now!