Peanut Port 489? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 10-28-2009, 11:17 PM
airboat's Avatar
Registered User
 
Last photo:
Join Date: Mar 2006
Location: Canada
Posts: 286
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Peanut Port 489?

I thought that would get your attention! So I'm thinking I want to keep the torque (BOAT) at 1500 - 3500 RPM, want to run up to 5000 RPM. One block looks like new as does the pistons but it's a 330 HP marine, flat tops with 360 peanuts. Love the engine!

Other block I have is .030 over and I'm sure if I hone clearance for a Fresh Water Cooled engine I don't need to bore it either. So use this block with a 489 stroker kit, negative deck height. Right around 9-1+

Save the standard block, re-ring as pistons and bore like new. Use it as a backup engine,

I think i know the answer but should I put the peanuts on the 489 to retain my tube dragging and wakeboard stuff or is a set of 781's going to hurt my performance much? I have a set of both and the performer intake measures the same as the 360's but the 781's are bigger. I probably spend more time with young kids at the moment pulling 1500 to 3500 RPM me skiing. If someone wants to barefoot 5000-5500 RPM would just to show what it would do.

Man' roating assy kits! Pretty cool stuff! $100 to move pistons to rods is part of the descision.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-29-2009, 10:40 AM
Registered User
 
Last photo:
Join Date: Aug 2009
Location: CT/MA
Posts: 30
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by airboat
I thought that would get your attention! So I'm thinking I want to keep the torque (BOAT) at 1500 - 3500 RPM, want to run up to 5000 RPM. One block looks like new as does the pistons but it's a 330 HP marine, flat tops with 360 peanuts. Love the engine!

Other block I have is .030 over and I'm sure if I hone clearance for a Fresh Water Cooled engine I don't need to bore it either. So use this block with a 489 stroker kit, negative deck height. Right around 9-1+

Save the standard block, re-ring as pistons and bore like new. Use it as a backup engine,

I think i know the answer but should I put the peanuts on the 489 to retain my tube dragging and wakeboard stuff or is a set of 781's going to hurt my performance much? I have a set of both and the performer intake measures the same as the 360's but the 781's are bigger. I probably spend more time with young kids at the moment pulling 1500 to 3500 RPM me skiing. If someone wants to barefoot 5000-5500 RPM would just to show what it would do.

Man' roating assy kits! Pretty cool stuff! $100 to move pistons to rods is part of the descision.
Im still a BBC newbie but Im pretty confident I know the answer: ditch the peanut ports, especially if youre throwing more cubes at it.

Ive never been impressed with any of the peanut port headed 330hp big block ski boats Ive been in, skied behind, or driven. I would have smoked any one of them out of the hole with a stock small block Ford (351w). Top end was another issue, as the BBC's ran steep props and could turn them the same 4400rpm- so they eventually topped out around 50.

Everything I read about the peanuts suggests they just dont flow well over 4k RPM's on a 454. Propping it to top out around 4400 should maximize your top end. Stroking the motor and using those heads would have it running out of breath even earlier- by 4000 I would think. It would come out of the hole great, but thats about it.

Ive built a few small block Fords for my ski boats and designing them to make most of their power in the 2500-5200 RPM range has worked really well, both for increasing top end speed and improving midrange power. A wicked holeshot usually is an additional bonus. Actually, we do a lot of slaloming and barefooting, and Ive yet to find a boat that comes out of the hole as fast as my 19' 351w with ~350hp- it was built to pull. If you pay close attention to your tach, you'll notice how little you actually turn in the 1000-2500 RPM range. Unless youre slowly accelerating and pulling a tube at 10mph, youre likely well above 2000 RPM once youre on plane. You likely get an instant 2500 RPM if you go WOT out of the hole (due to prop slip), sort of like a high stall torque converter.

Long story short, build for mid-upper RPM power. Dont go crazy (5500+) but dont be too conservative either. Those peanut ports would choke you- go with the large ovals at a minimum. Ive got the rectangles on my Barefoot Nautique and the holeshot is ok. Probably a half notch below the stock peanut port stock motors. Still plenty to pull 2 big barefooters out of the water though. And boy does it sing up top.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-29-2009, 06:06 PM
airboat's Avatar
Registered User
 
Last photo:
Join Date: Mar 2006
Location: Canada
Posts: 286
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Yeah! With the extra stroke the large ovals should work nice. I have large oval closed chambers (063's) on my airboat 489 and it doesn't lack for bottom end. Same flat top combination so airboat has a little more compression.
Yeah the 1500-1800 Rpm pulling is slow tube or beginner wakeboarders. I quit barefooting so unless my kids take it up? still love slalom!
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-31-2009, 08:31 PM
airboat's Avatar
Registered User
 
Last photo:
Join Date: Mar 2006
Location: Canada
Posts: 286
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Beer in hand, staring at the blocks on the bench, it came to me!
Put the 454 back together fresh rings and bearings, Comp 270 S cam and pull the closed chamber large ovals (063's) off my airboat 489 to complete my spare engine.

Large oval open chamber 781's installed on airboat 489 engine with current Crane 284 H12, pull out of airboat and install in ski boat.

Build a roller cam 489 with the other block, find a set of heads for the airboat!
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-31-2009, 09:01 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 40
Posts: 5,149
Wiki Edits: 16

Thanks: 0
Thanked 4 Times in 4 Posts
Now you're talking. Peanuts on a big cube engine will keep your power band where you want it, but not more. You were talking about 5000 rpms... not with peanuts in a big block.

In many cases the peanuts are fine for super low RPM, but you're giving up a whole lot. Large ovals like 049s or 781s might cause you to lose a tiny bit of low end torque, but certainly worth it for the mid-range torque and upper end HP that you gain.

There is a point at which smaller is just that... smaller. Many times people think that if you go really small you'll have really huge torque numbers at low RPMs, but the truth is it just starts becoming a restriction. For instance; put peanuts on your big block and you can make 500 lb-ft at 1800 rpm. Now swap to ovals and you'll shift your torque peak up to 550 at 2200... but you might still be making that same 500 at 1800 rpms.

If you think of it graphically, as you go with smaller components, the HP peak drops down and left while the torque peak goes up and left. Once you get to a certain point, they both just start dropping down. Peanuts would be doing that. You would be shifting the torque peak left in the RPMs, but also restricting things to a point where it would be pulling the peaks down as well.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Peanut Port 454 build bobbypantera Engine 71 10-04-2013 06:38 PM
BBC Peanut Port manifold and 049 Cyl Head? Ted B Engine 1 12-09-2008 01:09 AM
Teach me about exhaust port shape... staleg Engine 1 09-18-2008 07:11 AM
Will an oval port intake work with round ( peanut ) port heads? quintorca Engine 6 02-14-2008 11:43 AM
Where is the timed vacuum port and constant port on my Edelbrock Q-jet? Porchev Engine 3 11-22-2007 09:21 PM


All times are GMT -6. The time now is 06:22 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.