long rod 302 build !!!!!
Thread Starter
|
Mountain Pass
Joined: Mar 2009
Posts: 122
Likes: 0
From: RGV,TX
long rod 302 build !!!!!
ive been searching for threads on this and couldnt find much info, so im wondering whats involved and what are the exact benifits of using a longer rod. im planning on building this for drag racing purposes, not competition just a weekend warrior. thanks appreciate any info guys
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The idea behind a long rod design is to keep the piston at TDC longer which will build a little more pressure and produce a little more TQ. And when I say "a little" that's exactly what it is.. barely enough to measure. The rod ratio is but one thing to consider when building a motor, for racing purposes there are all sorts of other factors that have a bigger impact on power production.
Postmaster
Joined: Jul 2003
Posts: 3,934
Likes: 0
From: iowa
The idea behind a long rod design is to keep the piston at TDC longer which will build a little more pressure and produce a little more TQ. And when I say "a little" that's exactly what it is.. barely enough to measure. The rod ratio is but one thing to consider when building a motor, for racing purposes there are all sorts of other factors that have a bigger impact on power production.
Senior User
Joined: Jan 2004
Posts: 299
Likes: 0
From: Mt. Home, ID
I asked my machine shop guy about this last week. His opinion was that my truck motor (which will never, ever, see above 3500rpm) wouldn't benefit at all from longer rods. That doesn't make him an expert but I know him well enough to trust his opinions.
Posting Guru
Joined: Oct 2003
Posts: 1,955
Likes: 0
From: Quesnel, BC, Canada
shorter rods actually increase piston speed during the up and down time in the cylinder, this will increase air velocity (int & exh) at lower rpm, so its beneficial. Shorter rods also decrease dwell time near TDC & BDC. So they start the piston on the down stroke earlier than long rods, they also travel down the cylinder faster. So this is all indicative that lower octane fuel be run. Lower octane ignites and burns faster than high octane.
heres a rod vs stroke thread i did a few years ago
https://www.ford-trucks.com/forums/5...od-stroke.html
heres a rod vs stroke thread i did a few years ago
https://www.ford-trucks.com/forums/5...od-stroke.html
Trending Topics
New User
Joined: May 2010
Posts: 10
Likes: 0
From: St. Clair Shores, MI
For naturally aspirated engines, I have seen many people use a longer rod to decrease of the compression distance of the piston. By forcing the pin up, it makes for a shorter and lighter part. Typically I've seen this in engines that are going to run over 8k though.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Thread
Thread Starter
Forum
Replies
Last Post
WentzMetalWorks
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
24
Mar 9, 2025 08:36 PM
enginebuilder5
1987 - 1996 F150 & Larger F-Series Trucks
9
Jun 10, 2016 05:21 AM
6inarowmakeitgo
Ford Inline Six, 200, 250, 4.9L / 300
83
Nov 11, 2012 07:16 AM
tigwelder
1999 - 2003 7.3L Power Stroke Diesel
14
Jun 6, 2010 04:40 AM
