|
Re: 383 RPMs?
[Re: char69ger]
#2553418
09/22/18 11:31 PM
09/22/18 11:31 PM
|
Joined: Nov 2005
Posts: 15,118
85086
moparpollack
Lil Herman
|
Lil Herman
Joined: Nov 2005
Posts: 15,118
85086
|
What's the max RPMs I should spin a stock 383? Open question, and not blow up, be in an effective power band, or plan to race and need advice selecting a gear for the street?
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
|
|
|
Re: 383 RPMs?
[Re: RUNCHARGER]
#2553625
09/23/18 01:55 PM
09/23/18 01:55 PM
|
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
CompSyn
pro stock
|
pro stock
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
|
5500 then. I've seen tons of 383s with spun bearings. I'm not sure how true they are but a couple reasons I've heard for the 383 spun bearing condition are the following: 1) The factory rod bolts would stretch on the high revs and were thus the weak link. 2) The 383 at high revs would suck the factory oil pan dry, even with the stock volume oil pump and cause momentary oil starvation at the rod journals. Again, don't know if this is nothing more than hearsay, and certainly these issues could manifest in any stock engine that's over-rev'd. That said, the 383 was mass produced and market towards the value crowd who undoubtedly ran the holy hell out of these engines. The notoriety of spun bearings and blown blocks, probably a combination thereof... In any case, the two conditions mentioned above; pretty easy to remedy.
|
|
|
Re: 383 RPMs?
[Re: CompSyn]
#2553639
09/23/18 02:24 PM
09/23/18 02:24 PM
|
Joined: Jan 2004
Posts: 8,233
fredericksburg,va
cudaman1969
master
|
master
Joined: Jan 2004
Posts: 8,233
fredericksburg,va
|
5500 then. I've seen tons of 383s with spun bearings. I'm not sure how true they are but a couple reasons I've heard for the 383 spun bearing condition are the following: 1) The factory rod bolts would stretch on the high revs and were thus the weak link. 2) The 383 at high revs would suck the factory oil pan dry, even with the stock volume oil pump and cause momentary oil starvation at the rod journals. Again, don't know if this is nothing more than hearsay, and certainly these issues could manifest in any stock engine that's over-rev'd. That said, the 383 was mass produced and market towards the value crowd who undoubtedly ran the holy hell out of these engines. The notoriety of spun bearings and blown blocks, probably a combination thereof... In any case, the two conditions mentioned above; pretty easy to remedy. #2--True of ALL big blocks and Hemis, the high volume pump, deep pans, more oil, and the duel line system came about for this reason. My 383 turned 6800 easy with 8 quart pan and big pump, stock rods-good bolts and adjustable rockers-good springs
|
|
|
Re: 383 RPMs?
[Re: cudaman1969]
#2553652
09/23/18 02:48 PM
09/23/18 02:48 PM
|
Joined: Jan 2003
Posts: 15,976
Chilliwack B.C. Canada
RUNCHARGER
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 15,976
Chilliwack B.C. Canada
|
Yes: Remember the 383's had a smaller oil pan too. I believe that's why they spun bearings. There is no reason to spin a stock 383 higher than 5500 anyway.
Back in the day there were plenty of quick 383's out there that didn't spin bearings but I think it was because their driver's knew they didn't go any faster by over revving them.
Sheldon
|
|
|
Re: 383 RPMs?
[Re: cudaman1969]
#2553654
09/23/18 02:50 PM
09/23/18 02:50 PM
|
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
CompSyn
pro stock
|
pro stock
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
|
5500 then. I've seen tons of 383s with spun bearings. I'm not sure how true they are but a couple reasons I've heard for the 383 spun bearing condition are the following: 1) The factory rod bolts would stretch on the high revs and were thus the weak link. 2) The 383 at high revs would suck the factory oil pan dry, even with the stock volume oil pump and cause momentary oil starvation at the rod journals. Again, don't know if this is nothing more than hearsay, and certainly these issues could manifest in any stock engine that's over-rev'd. That said, the 383 was mass produced and market towards the value crowd who undoubtedly ran the holy hell out of these engines. The notoriety of spun bearings and blown blocks, probably a combination thereof... In any case, the two conditions mentioned above; pretty easy to remedy. #2--True of ALL big blocks and Hemis, the high volume pump, deep pans, more oil, and the duel line system came about for this reason. My 383 turned 6800 easy with 8 quart pan and big pump, stock rods-good bolts and adjustable rockers-good springs So you're saying 6,800 rpms with non-factory "good" rod bolts?
|
|
|
Re: 383 RPMs?
[Re: CompSyn]
#2553938
09/24/18 02:03 AM
09/24/18 02:03 AM
|
Joined: Jan 2004
Posts: 8,233
fredericksburg,va
cudaman1969
master
|
master
Joined: Jan 2004
Posts: 8,233
fredericksburg,va
|
5500 then. I've seen tons of 383s with spun bearings. I'm not sure how true they are but a couple reasons I've heard for the 383 spun bearing condition are the following: 1) The factory rod bolts would stretch on the high revs and were thus the weak link. 2) The 383 at high revs would suck the factory oil pan dry, even with the stock volume oil pump and cause momentary oil starvation at the rod journals. Again, don't know if this is nothing more than hearsay, and certainly these issues could manifest in any stock engine that's over-rev'd. That said, the 383 was mass produced and market towards the value crowd who undoubtedly ran the holy hell out of these engines. The notoriety of spun bearings and blown blocks, probably a combination thereof... In any case, the two conditions mentioned above; pretty easy to remedy. #2--True of ALL big blocks and Hemis, the high volume pump, deep pans, more oil, and the duel line system came about for this reason. My 383 turned 6800 easy with 8 quart pan and big pump, stock rods-good bolts and adjustable rockers-good springs So you're saying 6,800 rpms with non-factory "good" rod bolts? All I can say is my engine lived (in fact I still have it in storage) aftermarket bolts where installed around 1976 era. Engine was balanced, Mannly slugs, 509 hyd cam. Many years ago I saw that a S/S 70 Cuda stick car that shifted his 8500 and thru the traps at 8700, this was before the good rods.
|
|
|
Re: 383 RPMs?
[Re: char69ger]
#2554720
09/25/18 09:00 PM
09/25/18 09:00 PM
|
Joined: Dec 2014
Posts: 5,754
ohio
ruderunner
master
|
master
Joined: Dec 2014
Posts: 5,754
ohio
|
I float valve's at 5800. Bottom end doesn't notice.
Angry white pureblood male
|
|
|
|
|
