I've got a head from a 1968 Case gas 580ck (159c.i.) on the workbench. Boy are the ports on these castings ever crude, they're not even close to matching the gaskets. What stands to be gained by spending a few hours and getting the manifolds and head to match the gaskets? Would a 10% gain in power be realistic?
- Thread starter atlarge54
- Start date
Anonymous-0
Well-known Member
The most important area in a flowed head is the 1/2 inch before the valve seat.I dont think 10% is realistic ,but under the theory of every little bit helps it could be a better running engine with the casting flash smoothed out.Now all kinds of guys are gonna warn you about smooth intake ports,fuel puddling etc etc.Im just saying it cant hurt.If you really want to go at it you need Cratex rubberized grinding wheels and work the seat area to a nice radius in and out of the valve seat.Kinda like a 30 thousand dollar Serdi does with cutters.I have a whole file drawer on air flow and there is quite a bit to it.You are trying to improve volumetric efficency.Other improvements of power are thermal efficiency,and mechanical,but biggest gains are from volumetric efficency improvments.So yeah it cant hurt power[it can really but thats a whole new subject called ports too large]
why.. becuase most tractors are limited to max torque or close and the rpm is kept very very very low.... and therefore the manifold is usually good for twice the flow that they run..
with that said... if you bypass the govoner, and run it a 5000 rpms.. then by all means the port and polish job will help... but then the engine could not pull for sustain periods of time with out over heating and would need to be overhauled in less than 1/3 of the normal hours...
so if your running it 10 hours a year at tractor pulls for 10 minutes at a time..yes.. if you running 2000 rpm in the field, then your probably not gonna see the improvement.
remember that if you double rpm, you quaduple wear..
good luck.. bill
with that said... if you bypass the govoner, and run it a 5000 rpms.. then by all means the port and polish job will help... but then the engine could not pull for sustain periods of time with out over heating and would need to be overhauled in less than 1/3 of the normal hours...
so if your running it 10 hours a year at tractor pulls for 10 minutes at a time..yes.. if you running 2000 rpm in the field, then your probably not gonna see the improvement.
remember that if you double rpm, you quaduple wear..
good luck.. bill
buickanddeere
Well-known Member
Nothing wrong with blueprinting the engine and making parts align and fit.
Did I read somewhere here that it doesn't matter if the ports and manifolds don't match. Then again it doesn't bother some people to drive a vehicle having different coloured doors on them.
The ports should align plus the casting flash and rough/sharp edges blended around the valve bowl/seat.
10%, maybe but the engine will certainly run smoother if each cylinder gets a more uniform charge.
Did I read somewhere here that it doesn't matter if the ports and manifolds don't match. Then again it doesn't bother some people to drive a vehicle having different coloured doors on them.
The ports should align plus the casting flash and rough/sharp edges blended around the valve bowl/seat.
10%, maybe but the engine will certainly run smoother if each cylinder gets a more uniform charge.
I often did a mild cleanup on race engines, not much more than cleaning up casting flash. You want to be very carefull about changing the shape of valve bowls and ports.
I learned that unless you know what your doing, you tend to make big shiny holes that flow no more and sometimes less than stock.
A flow bench and knowing how to use it are required for porting work that actually improves things.
On some engines, removing the mismatch between manifold and head removes a reversion dam that helps charge cylinders at lower rpm.
I learned that unless you know what your doing, you tend to make big shiny holes that flow no more and sometimes less than stock.
A flow bench and knowing how to use it are required for porting work that actually improves things.
On some engines, removing the mismatch between manifold and head removes a reversion dam that helps charge cylinders at lower rpm.
Anonymous-0
Well-known Member
That reminds me of a book I have that says;Dont play Jerry Branch[Branch Flowmetrics]unless you are Jerry Branch.Then there are porters that use the term "flow bench proven design".Dont have a flowbench but paid someone to do a set of heads then they try to copy the same shapes.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.
Copyright © 1997-2024 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy