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Chief porting

Moderators: Curt!, Pa

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dotman

Posts: 582

Joined: Fri Oct 01, 1999 12:01 am

Location: meridian, id. usa

Post Sun Jul 29, 2001 4:55 pm

(It heps if you have a book on porting and polishing to guide you like pro engine blueprinting or flathead related speed books
not essintial but well worth the monet for the info)
first remove all valve related parts,
bead blast the crud off until its clean metal
in through the ports
may as well do the whole outside surface area
while your at it.
get your handy dremal and burr set along with
sanding drums and alot of those little drums
start on cleaning all the casting flash out of all the ports until the intakes surfaces are smooth from the intake spigot to the bottom of the valve set all the way around.
smooth not polished.
do the same on the exhaust but make it shine
and that should just about do it.
you dont have to make the diameter larger u just need to make the transistions smooth

[This message has been edited by dotman (edited 29 July 2001).]
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Dusty-Dave

Posts: 876

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Sun Jul 29, 2001 5:17 pm

robinmcq:
All of the normal port work helps but the best inprovement unless you already have it is the change to popup Bonneyville type pistons or better yet change to 80 wheels and pistons which give the same popup. you will have to raise the combustion chamber to use these pistons (leave about .026 head clearance) witch increases the opening into the cylinder.
Dusty
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Dusty-Dave

Posts: 876

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Fri Aug 03, 2001 4:12 am

The releaving was to direct more flow of mixture to the cylinder the second greatest problem of a flathead is the restriction caused by squish area over most of the piston. Although Indians popup pistons and raised squish area wheren't as good as the last KRs it was very good and easy to do.
The major problem with flathead combustion chambers was the tendacy to detonate because of the long shallow chamber the squish area was to shorten the chamber while combustion was going on. And this would allow higher compression.
Pop me your email addr. and I'll send a copy of Tuning The Flathead I think most of the old timers on the list have a copy from the severall times I've sent them out.
Have your heads already had the Bonneyville treatment? Are you building a 74 or 80? What year? Have you found the Virtual Indian site and list yet? http://virtualindian.org/index.htm
Dusty

[This message has been edited by Dusty-Dave (edited 03 August 2001).]
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panic

Post Fri Aug 03, 2001 11:06 pm

Dave - can I get a copy? I don't think I've seen this.. Thanks!
<mailto:panic@victorylibrary.com>

------------------
Click here to see my Pages-O-Tech-Stuff
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Boogiemanz1

Posts: 896

Joined: Mon Mar 06, 2000 1:01 am

Location: Bixby,OK, USA

Post Sat Aug 04, 2001 11:14 pm

Dave, Any chance I could get a copy of that also?
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Cotten

User avatar

Posts: 2674

Joined: Thu Sep 30, 1999 12:01 am

Location: Central Illinois, USA

Post Sun Aug 05, 2001 2:46 am

gosh, Dave, I guess I need one too!
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meatball45e

Posts: 6

Joined: Fri Apr 20, 2001 12:01 am

Location: bel air md. usa

Post Sun Aug 05, 2001 6:20 am

Hey dave....count me in , i would like ta have a copy also !
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Guy Winton III

Posts: 108

Joined: Wed Dec 01, 1999 1:01 am

Location: San Diego

Post Tue Aug 07, 2001 2:02 am

Copy for me too, please.
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Boogiemanz1

Posts: 896

Joined: Mon Mar 06, 2000 1:01 am

Location: Bixby,OK, USA

Post Tue Aug 07, 2001 2:12 pm

Thanks Dave!
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Cotten

User avatar

Posts: 2674

Joined: Thu Sep 30, 1999 12:01 am

Location: Central Illinois, USA

Post Wed Aug 08, 2001 2:46 am

Thanks from me, too, although the volume overloaded my server for an hour! I've been offline on my Outlook E. until I saved it to my harddrive.
Now if I can just figure out how to read it...
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Dusty-Dave

Posts: 876

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Wed Aug 08, 2001 3:06 am

Cotten:
Open the files one at a time with Kodak Photo preview or Kodak Photo Editor (on the win 98 disk or free on line) then print them. Or even use Internet explorer to open and print them, just type the path to where they are in your confuser on the address bar. They took almost an hour to upload If this is a real problem for anyone I can break them up into eight messages with two each. But don't have them in that format anymore so would have to make them again.
Dusty Dave
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Dusty-Dave

Posts: 876

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Fri Aug 10, 2001 2:44 am

Robin:
If it's working properly the iron pump is fine.
The thermal barriers are an excellent idea. All of the larger suppliers will stock the Bonney pistons. Be sure to measure your paticular engine before having the heads cut And be sure to allow for the brand of gaskets you will be useing. I prefer Hastings rings. If you use anything else assemble the piston with just the oil ring into a well oiled cylinder and measure pull required to move the piston. If more than about 3 lbs. carefully adjust the expander ring with a pair of needle nose pliars.
Dusty
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Dusty-Dave

Posts: 876

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Fri Aug 10, 2001 4:46 am

Robin:
Would you check the email addr. that you posted MSM sent a bounce notice but they didn't give a reason. If it isn't an addr. problem I'll try smaller attachment size.
Dusty Dave
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HOOTER

Posts: 1319

Joined: Sun Feb 25, 2001 1:01 am

Location: State College, Pa.

Post Fri Aug 10, 2001 4:54 am

Dusty

Nice bit of info on the oil rings. Where did ya get that from? Just makes me want to spend a little bit more time testing ring tensions. I usually paint my piston skirts and crowns with a molybdenum compound and bake it on. Makes the skirt slippery and acts as a thermal barrier on the crown.

HOOT
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greybeard52

User avatar

Posts: 1050

Joined: Tue Dec 05, 2000 1:01 am

Location: Chatham, NJ, USA

Post Fri Aug 10, 2001 4:12 pm

Moly on the skirts is a lot better than the old way of knurling the skirt to hold oil. G
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abbottmach@aol.com

Posts: 1

Joined: Tue Aug 14, 2001 12:01 am

Location: Alton, IL

Post Tue Aug 14, 2001 7:25 pm

I have started modifying Indian heads the way the KR's were done. Seems to work well. The big restriction on flathead breathing is generally the area around and above the intake valve, which is why the KR's were relieved there. This is also why raising the compression on a flatty is a mixed bag
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