User Tag List
Results 16 to 30 of 77
Thread: Ported Promax build
-
12-04-2020, 08:30 AM #16
Sent the block to the machine shop to get bored.
He called and said it will bore 0.015" no problem.
Going with Vertex coated pistons. He found a cravk in the bottom of the block where the 2 studs meet the exhaust divider. Says it common and would weld it up better and stronger. Also asked about porting. What boat it going on and what I want the engine to do.
-
12-04-2020, 11:30 AM #17
The exhaust ports look like that from the factory on the FF and PM sleeves due to how they are cut. I raised the exhaust to 1.540 shelf and 1.450 chamfer and smoothed the corners. This is a proven port map. The exhaust divider surface was welded and filled like a 260 in the corners. Oil injection gear was filled. Broke in and set up correctly it should be a strong runner especially with the addition of the slider and ACU. I haven’t had a chance to look at the curves as I am still at the hospital with my wife. Hopefully she will go home today an I can compare the curves and make a determination of which one you need.
Last edited by wrechin2; 12-04-2020 at 11:34 AM.
James Perry
-
roadkill636, bullet20vee thanked for this post
-
12-04-2020, 09:25 PM #18
Glad to hear your wife is heading home with good health.
Don't give up all of Roadkills and Last Minute Racing's secrets.��Last edited by Baker343; 12-04-2020 at 09:27 PM.
-
roadkill636 thanked for this postroadkill636 liked this post
-
12-08-2020, 08:45 AM #19
Removed the 2 stage reeds and lapped the cages down to 400gt. Good thing too. One cage had a bad casting flaw in it rite on a sealing surface. Took a good bit of lapping with 180gt to get it true and flat again. And installed some single stage custom cut fiber reeds.
-
12-08-2020, 02:54 PM #20
-
12-08-2020, 03:32 PM #21
They are NOT tear drop
-
12-08-2020, 06:02 PM #22
-
12-08-2020, 06:12 PM #23Screaming And Flying!
- Join Date
- Dec 2001
- Posts
- 9,503
- Thanks (Given)
- 23
- Thanks (Received)
- 270
- Likes (Given)
- 191
- Likes (Received)
- 1975
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Tear drops bend easyer.... flow more..... JMO......The narrow section is where the reed bends.....easyer than straight cut ......It don't flow down below.... the 1/2 mark unless ya blend the surface.......JMO.....And that exhaust port work was sloppy..........
-
Baker343 thanked for this post
-
12-09-2020, 03:24 PM #24
Got the block back from James. And he did a wonderful job. Excellent attention to detail. Welded the bottom up and cut like a 260. Bored 0.015" all 6. Filled oil gear. Ported. Milled exhaust and deck flat. And and got the bunny stamp of approval
-
SS Minnow thanked for this postwrechin2, coffeeguy, FMP, ProComp, tnelsmn, Hydrodreams, Michael J Giesler, JR IN JAX, SS Minnow, Smalltownbassin liked this post
-
12-09-2020, 05:23 PM #25Screaming And Flying!
- Join Date
- Feb 2015
- Location
- Ontario
- Posts
- 8,091
- Thanks (Given)
- 205
- Thanks (Received)
- 321
- Likes (Given)
- 1921
- Likes (Received)
- 2005
- Mentioned
- 2 Post(s)
- Tagged
- 0 Thread(s)
Deck to piston at TDC, gasket thickness, squish clearance, psi ?
Last edited by FMP; 12-09-2020 at 05:48 PM.
-
12-09-2020, 07:00 PM #26
Intake side exhaust side sqiish.
I never measured squish before so I probly did it wrong
-
12-09-2020, 07:02 PM #27
75 gaskets 35cc heads.
I'm still in break in mode with 25-1 oil and 43psi fuel and they all settling down at 140-143psi so farLast edited by roadkill636; 12-09-2020 at 07:09 PM.
-
12-11-2020, 02:52 PM #28Junior Member
- Join Date
- Aug 2020
- Location
- Abingdon Virginia
- Posts
- 16
- Thanks (Given)
- 2
- Thanks (Received)
- 0
- Likes (Given)
- 2
- Likes (Received)
- 13
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Road Kill, Who did you say shortened your mid? I have a 20 id like cut to a 15. Thanks
-
12-12-2020, 10:12 PM #29
-
12-12-2020, 10:25 PM #30
That porting job looks perfect. He should be a brain surgeon with that kind of skill.
"Confidence" is that wonderful feeling you had right before you fully understood your true situation.- Unknown
I don’t know what effect these men will have upon the enemy, but, by God, they terrify me.- Duke of Wellington“I am not afraid of an Army of lions lead by a sheep; I am afraid of sheep lead by a lion.” – Alexander the Great
Whoever said the pen is mightier than the sword obviously never encountered automatic weapons.-Douglas MacArthur
Allison GSE 300XS
-
roadkill636 liked this post
Similar Threads
-
Ported promax block
By suprmag225 in forum Misc. Parts and AccessoriesReplies: 12Last Post: 07-22-2020, 08:21 AM -
1996 2.5 mod ported promax block. .030 over big bearing.
By superboattwin250 in forum Misc. Parts and AccessoriesReplies: 6Last Post: 03-06-2016, 08:34 PM -
Brand New ported 225 promax
By dez nuts in forum Outboard EnginesReplies: 3Last Post: 08-12-2014, 05:17 PM -
new ported 200 promax
By dez nuts in forum Outboard EnginesReplies: 0Last Post: 08-12-2014, 01:38 PM