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Posted:
Fri Aug 08, 2008 10:45 pm
by 106-1194218389
Thanks John,
and so would a "D" shaped piston dish with some quench be the way to go?
Posted:
Sat Aug 09, 2008 5:27 am
by jsa
Posted:
Tue Aug 26, 2008 9:37 pm
by larrycavan
I can't begin to tell you how much I admire what you're accomplishing. You're always making positive moves with discarded parts!......That is a true hot rodder if there ever was one!
Question - Why did you reverse the pipes at the carb where the two turbo feeds join?
Larry C
Edited By larrycavan on 1219801156
Posted:
Wed Aug 27, 2008 7:43 pm
by larrycavan
Not to change the subject but I received and email from my Megasquirt supplier the other day. There was an old Stude that set a record at Bonneville with one of their FI setups on it. .....
Posted:
Wed Aug 27, 2008 9:31 pm
by 106-1194218389
Like I have said I get excited to see you go fast! I know you are not high dollar but you have ingenuity and brains. I have seen some local racers here dump bushel baskets of $100 bills in their cars and not go as fast as you have. It would scare me if you had some strong financial backing. Can you imagine how fast you would go? Question is would you have as much fun? Keep up the great work. You inspire me as sometimes I get down a little because I do not have the money to put in my stuff like I used to. And don't get me wrong you have a great ride I would be proud to have. Your ride is what racing should be about.
John
Posted:
Tue Sep 23, 2008 9:49 am
by 200cfm
My wife and I took our first vacation in many years and spent a week in Lancaster, Pa. While there we visited Bruce and his wife. Got to see the new PTS flowbench in action and picked up a new PTS pitot tube. Bruce was a gracious host taking time to show us the shop, his massive lathe, mill machines, etc. And he reviewed one stude cylinder head I hauled up for analysis. I came back all fired up about the new PTS bench project and cylinder head flow research. Thanks Bruce for your hospitality and time.
Posted:
Tue Sep 23, 2008 8:32 pm
by bruce
Tom, Yes I enjoyed your visit! I'm glad I was able to show you around the "World Headquarters"!
I can always take the time for visitors
Edited By bruce on 1222216390
Posted:
Thu Sep 25, 2008 10:04 am
by 200cfm
Have cut up one good head for easier study and research. Delivered this chamber to a machinist for a valve enlargement and once I get it back I hope to improve the flow and speeds. Test valve will be a 1.900" valve with a back cut and 30/45/60 bowls. Will save the other chambers for a smaller valve study. I flowed it with the stock valves for a base reference and mapped the port speeds with the new PTS pitot.
Posted:
Thu Sep 25, 2008 10:28 am
by 106-1194218389
Tom,
You're scaring me. You are getting serious. I am going to have to "shelf" my SBC as I don't want to get beat by a Stude. I know you are going to get this thing to fly. It already impresses the heck out of me. Keep going. I love your story.
John
Posted:
Thu Sep 25, 2008 8:09 pm
by 106-1194218389
I have been interested in the Engine Master's Challenge and have been trying to follow it. I found an excellent article by David Vizard and suggest you read this as it may help in developement of your engine. David Vizard's I know I will read it as I develope mine.
John
Posted:
Fri Sep 26, 2008 12:05 am
by 200cfm
That was a good read article, thanks. Sure wish I had a bigger bore. The stude 289 has a stroke of 3.625 on a 6.625 rod for a 1.827 rod/stroke ratio. The motor I hope to build up this winter will be a .060" over bore on stude 3 9/16 bore to make 3.625 bore for 299 cubes. Perfect square motor. The motor I lost was this dimensions. Not sure if the 1.900 valve will clear that bore at this point. I do know a 1.840 valve clears ok.
Currently trying to get a motor ready for fall season here if possible. It will have an .118" over bore for 3.680" using Ford 6 cylinder pistons and the stroke will be a welded up 3.625 to make 3.875". This nets 330 cubes with 1.710 rod/stroke ratio.
Looks like an under size combo.
Used the cut up head on the block to see how close the bigger valve cleared the wall. Here is photo. Valve is 1.940" and it cleared by ruffly .030" But didn't go with this size on the mock cut head cylinder. Went with 1.900 which will clear just fine on 3.680 and may or may not clear on 3.625 bore. Valve here was painted red to show photo better. Some red reflection got into the cylinder glaze.
Here is chamber with stock valves 1.655 / 1.520 Note those quench eyebrow pads and what look like swirl bumps in the chambers.
Posted:
Fri Sep 26, 2008 12:54 pm
by 106-1194218389
Nice photos. You are bringing out "John, the Mad Machinist" in me again. I was known for doing weird stuff. I see you have replaceable valve guides. They look to be .500" od guides. Find some that are larger on the od and set your head up in a mill and offset bore the guide holes in the head to move the intake valve more to the center line of the cylinder. Then also install a smaller exhaust valve. You will have to install new seats in the exhaust when you do that though. With your combo I bet you could get away with a 1.45" exhaust valve. That way your could easily go to the 1.940" intake and get it away from the cylinder wall. Can it be done? Done it , been there. I have gone as far as putting a cast iro set of Buick 300 heads on a 215 Aluminum block Buick to get bigger valves and ports. Had the heads welded up with cast iron in a special process to raise the ports. Had to make our own head gaskets. Was in a sand racing jeep. It would just kill Small Block Chevys. Lots of work though.
John
Posted:
Fri Sep 26, 2008 4:57 pm
by 49-1183904562
Tom,
Nice photos I would agree with John, Goodson sells a nice Bronze guide blank that might work. But based on your above post it looks like you get all your machine work done outside and this could get pricey as this must be done on a mill.
Rick