Go Back  Offshoreonly.com > Technical > General Q & A
Promaxx 320 flow numbers >

Promaxx 320 flow numbers

Like Tree160Likes

Promaxx 320 flow numbers

Reply

Old 10-29-2017, 12:35 AM
  #261
Platinum Member
Platinum Member
iTrader: (4)
 
endeavour32's Avatar
 
Join Date: May 2009
Location: Chicago, IL; Onekama, MI
My Boat: 37 Active Thunder- "Stealin' Thunder"
Posts: 3,666
Default

Those exhaust numbers can't be correct are they? Those are as high as a typical intake runner at that level. Did Jim split the intake and exhaust numbers by mistake, when really, those are all intake numbers?
SB likes this.
endeavour32 is offline  
Reply With Quote
Old 10-29-2017, 01:56 PM
  #262
Registered
Platinum Member
Thread Starter
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
My Boat: 12 meter
Posts: 5,933
Default

Good catch mike I screwed that up. how I did that I have no clue. Should be posting exh this week.

Last edited by getrdunn; 10-29-2017 at 01:59 PM.
getrdunn is offline  
Reply With Quote
Old 10-29-2017, 02:04 PM
  #263
Registered
Platinum Member
Thread Starter
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
My Boat: 12 meter
Posts: 5,933
Default

[QUOTE=getrdunn;4588125]Jim got back on my heads between projects. He's not done yet but txt over some numbers Saturday.


.200-157
.300-240
.400-315
.500-370
.600-404
.700-424
.750-431

Raised the floors. (Corrected on 10/29/17)

Should have exh this next week.
getrdunn is offline  
Reply With Quote
Old 10-29-2017, 07:20 PM
  #264
Platinum Member
Platinum Member
iTrader: (4)
 
endeavour32's Avatar
 
Join Date: May 2009
Location: Chicago, IL; Onekama, MI
My Boat: 37 Active Thunder- "Stealin' Thunder"
Posts: 3,666
Default

Originally Posted by getrdunn View Post
Good catch mike I screwed that up. how I did that I have no clue. Should be posting exh this week.
Ha, I was going to say, those are some insane flowing exhaust ports. My heads have a strong exhaust port, but they are not flowing 315 @ .40
endeavour32 is offline  
Reply With Quote
Old 10-29-2017, 07:38 PM
  #265
Registered
iTrader: (4)
 
Rookie's Avatar
 
Join Date: Jan 2003
Location: Grand Rapids, MI
My Boat: 37 Active Thunder, 30 Scarab Panther, 34 Wellcraft Gran Sport
Posts: 4,306
Default

Originally Posted by endeavour32 View Post
Ha, I was going to say, those are some insane flowing exhaust ports. My heads have a strong exhaust port, but they are not flowing 315 @ .40
No, at 0.400" they should be around 248cfm, if these heads are based off the AFR exhaust. 297cfm @ 0.700"
Rookie is offline  
Reply With Quote
Old 10-29-2017, 08:19 PM
  #266
Registered
Platinum Member
Thread Starter
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
My Boat: 12 meter
Posts: 5,933
Default

Originally Posted by Rookie View Post
No, at 0.400" they should be around 248cfm, if these heads are based off the AFR exhaust. 297cfm @ 0.700"

Mike knew I misprinted but wanted to make note of it and have a little fun at the same time.

I noticed the promaxx 340 cnc head which probably has same exh port as the 317's flow like 300 @ 700 so I'd say very similar although the same 340 cnc head intake flows 398 at same lift. I'd like to see 315 @ .700. I recall Jim not real pleased with the out of the box exhaust numbers. If he can work his magic on those as he did the intakes will be a big thumbs up. At the very least more options regarding aftermarket.

Last edited by getrdunn; 10-29-2017 at 08:22 PM.
getrdunn is offline  
Reply With Quote
Old 10-29-2017, 08:28 PM
  #267
Registered
Platinum Member
Thread Starter
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
My Boat: 12 meter
Posts: 5,933
Default

Here's a their 340 cnc head flow numbers below:

ProMaxx BBC 340cc CNC Ported (Bare Heads)


Specs:
2.300"/1.880" valve sizes,
121cc-127cc chambers(Your Choice)
340cc Intake Runner

Flow Specs @ 28" w/2.300"/1.880" w/30* Backcut valves

.200" .300" .400" .500" .600" .700" .800" .900"
Intake 172 267 318 358 383 398 409 413

Exhaust 139 190 236 265 285 300 304 307
endeavor1 and endeavour32 like this.
getrdunn is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


OSO Sponsor
OSO Advertiser
OSO Advertiser
OSO Advertiser