|
Author
|
Topic: RPM limit for my 289?
|
streetstang67
Gearhead Posts: 397
From: SC, USA
Registered: Nov 2002
|
posted 01-28-2004 05:55 PM
   
My 289 has been rebuilt stock with a few mods (listed in my sig). How high can I rev this engine without risking damage? I hear that 289s can rev high because of the short stroke, but with a stock rotating assembly, whats the limit? I'm wanting to know because I'm choosing a cam and I want to choose one with the right powerband. I dont want to get one that pulls hard to 6500 rpms, when I can only safely rev to 6000rpms..or whatever? ------------------
'67 coupe: 289 bored .030 over, c-4 tranny
Holley 600 carb, edelbrock performer intake, Crane XR-i ignition, hooker comp headers, dual flowmaster exhuast C-4 (stock) 3.55s with traclok
IP: Logged |
Red65
Gearhead Posts: 115
From: Northglenn, CO, USA
Registered: Jul 2002
|
posted 01-28-2004 06:20 PM
I was informed that you can take a stock bottom end to 7000 rpm. I've chose components that should pull nicely to 6500 rpm, and I'll set the rev limiter somewhere just north of there.Rich 289 .030 over, Comp-Cams 284HR, Edelbrock Performer RPM 1.90 heads, Edelbrock Performer RPM intake, Holley 670 Street Avenger Carb, Comp Roller Rockers, MSD 6-AL, Tri-Y's, Top-Loader 4-speed.
IP: Logged |
Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
|
posted 01-28-2004 06:23 PM
With good machining, balancing, and rod bolts, 7k is not an issue.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
V-8
Gearhead Posts: 297
From: TURKEY/Istanbul
Registered: Dec 2003
|
posted 01-28-2004 07:21 PM
What about stock 351w rpm limit?
IP: Logged |
streetstang67
Gearhead Posts: 397
From: SC, USA
Registered: Nov 2002
|
posted 01-28-2004 07:29 PM
What about with normal rebuild machining and factory replacement rod bolts?------------------
'67 coupe: 289 bored .030 over, c-4 tranny
Holley 600 carb, edelbrock performer intake, Crane XR-i ignition, hooker comp headers, dual flowmaster exhuast C-4 (stock) 3.55s with traclok
IP: Logged |
V-8
Gearhead Posts: 297
From: TURKEY/Istanbul
Registered: Dec 2003
|
posted 01-28-2004 08:13 PM
quote:
Originally posted by streetstang67:
What about with normal rebuild machining and factory replacement rod bolts?
They had broken like a thin ice while we were torquing them (stock rod bolts).Then we change them with ARP rod bolts.
IP: Logged |
Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
|
posted 01-28-2004 08:43 PM
quote:
Originally posted by streetstang67:
What about with normal rebuild machining and factory replacement rod bolts?
6k would kill it.
No brag, just fact! 
------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
bill haab
Gearhead Posts: 441
From: south bend in.
Registered: Oct 2002
|
posted 01-29-2004 10:03 PM
My dyno went to 6300 rpm @ 566 hp in a supercharged 289.
IP: Logged |
MidLifCrisis
Gearhead Posts: 466
From: Frederick County, MD
Registered: Oct 2001
|
posted 01-30-2004 07:27 PM
streetstang67, as stated 6K is a death sentence.
Question: I know you have been doing a lot of research, so are you looking to race and manually shift your car? On the street, the majority of cruising is somewhere between 2000-3500 rpm. I believe stock automatic shift points are around 4500rpm. With stock heads and Performer intake, breathing would be limited so that winding to 6K in top gear would take a lot of road, if wind resistance didn't restrict it. If manually shifting, you can leave it in first and wind it until it screams like a banshee and lets loose all over the track. Good luck on your choice. Charlie
IP: Logged |
MidLifCrisis
Gearhead Posts: 466
From: Frederick County, MD
Registered: Oct 2001
|
posted 01-30-2004 07:31 PM
One other thing you could do is get rid of the C-4. You can add a gear with an AOD, or T-5 and let the gearing do the work. Run a 4.11 or better rear gear and the overdrive fifth gear will keep the RPM in the live-able range for the highway. Just a thought, but as usual, my thoughts require more money  Charlie
IP: Logged |
streetstang67
Gearhead Posts: 397
From: SC, USA
Registered: Nov 2002
|
posted 01-31-2004 12:11 PM
Sometimes I do manually shift, but as soon as I get my cam, I will adjust the shift points higher. AOD would be nice, but not in the budget yet.
IP: Logged |
CHIPSBAD67
Gearhead Posts: 396
From: LOU,KY;USA
Registered: Sep 2003
|
posted 02-01-2004 01:10 AM
if your machinist is compotent, 7k shouldnt be a problem. actually it shouldnt be a problem with a junkyard 289 that burns a quart of oil every week. just know ive had several "inferior" 5.0's and late model 302's with many miles in stock and modified form cranking 7k. not that i would recomend doing it for long periods unless your oilpan needs to breath. suposedly 289's will take more rpm than a 302...shorter stroke yadda yadda yadda. wait, im looking at your engine and really dont think its gonna matter what cam you put in, it aint gonna pull to 6 grand anyway. the heads/intake will be done around 5500 anyway. aod is a heavy pig in stock form and isnt as strong as your c-4 anyway. would cost a mint to build a decent aod, be a waste really unless youre going on a power tour. your cam sets your powerband but it must work with your converter and gear. there so much here i cant even begin to explain it. dont worry about overevving it unless you are racing it with the stock shifter and are worried about missing drive and hitting neutral, in which case you should be shot for racing with the stock shifter. dont get crazy with the cam size. dont get one that makes peak power at 6k if your heads are only good to 5k. dont get a cam that makes your car run like a yugo with a stock coverter till you hit 4 grand. dont get a coverter that stalls higher than your normal cruise rpm or you'll burn the thing up and it will suck to drive. or you'll be forced to shift it like a manual and now we are back to the stock shifter which is actually better suited on top of a christmas tree. man im crabby! ------------------
306, 4speed, 4.11's....best 1/8 mile 7.58 at 92mph with 1.72 60ft. PUMP GAS/NO ADDERS/STREET TIRES
IP: Logged |
streetstang67
Gearhead Posts: 397
From: SC, USA
Registered: Nov 2002
|
posted 02-01-2004 01:26 PM
I know the cam choice is important..any suggestions?------------------
'67 coupe: 289 bored .030 over, c-4 tranny
Holley 600 carb, edelbrock performer intake, Crane XR-i ignition, hooker comp headers, dual flowmaster exhuast C-4 (stock) 3.55s with traclok
IP: Logged |
MidLifCrisis
Gearhead Posts: 466
From: Frederick County, MD
Registered: Oct 2001
|
posted 02-01-2004 01:38 PM
CHIPSBAD67: very well put. Streetstang67 is just bewildered by the vast selection of what's available, with very little experience of how the different specs relate to actual performance. I know just how he feels.
It's all about a balanced set of components.STREETSTANG67: Do you have any members in your area that will drive you or let you drive their cars to compare real world performance to numbers on a spec sheet? If there was no ice and snow in Maryland, I'd toss you the keys and let you go for a spin.
Charlie
IP: Logged |
Mustangsandmore Forums
