Slant *       6       Forum
Home Home Home
The Place to Go for Slant Six Info!
Click here to help support the Slant Six Forum!
It is currently Thu Apr 18, 2024 9:42 pm

Unanswered topics | Active topics


» » »

All times are UTC-07:00



Post new topic  Reply to topic  Page 1 of 1
  [ 9 posts ] 
  Print view Previous topic | Next topic 
Author Message
Lobster1
 Post subject: 170 sustained RPM
PostPosted: Wed Feb 14, 2018 10:00 pm 
Offline
EFI Slant 6
User avatar

Joined: Fri Dec 16, 2011 4:18 pm
Posts: 345
Location: Portland, OR
Car Model:
Hey all, my 62 Lancer 4 speed 170 is running and driving. Thanks for all the support! I'm still running the original 170 with 3.73 gears. What would be considered the top safe RPM for sustained driving? My calculations show 3374 at 70. I'll confirm with my GPS.

Cheer,
Barnaby

_________________
These ones go to eleven...
Top
   
Reply with quote  
Dart270
 Post subject: Re: 170 sustained RPM
PostPosted: Thu Feb 15, 2018 4:00 am 
Offline
Board Sponsor & Moderator
User avatar

Joined: Mon Oct 21, 2002 11:08 am
Posts: 16505
Location: Blacksburg, VA
Car Model:
3400 should be just fine. I did thousands of miles like that in my 64 Dart 225 in the days before the 5spd. Note that you could probably cruise a 170 a lot higher, as far as rod/piston stresses go, but I wonder about crank and rod bearings?

Personally, I take my time to break in engines before I beat on them. If it were mine, I'd keep it under 3000 for 500-1000 miles to let everything settle and wear in. For a racecar, obviously this is not practical, but it is what I like to do with my motors if at all possible.

Lou

_________________
Home of Slant6-powered fun machines
Top
   
Reply with quote  
Lobster1
 Post subject: Re: 170 sustained RPM
PostPosted: Thu Feb 15, 2018 5:59 am 
Offline
EFI Slant 6
User avatar

Joined: Fri Dec 16, 2011 4:18 pm
Posts: 345
Location: Portland, OR
Car Model:
Thanks Lou! I'm actually still on the original motor, it shows a bit of cylinder wall wear. It doesn't smoke or burn oil. I should do a compression test.

Is the RPM riskier with an old motor?

B

_________________
These ones go to eleven...
Top
   
Reply with quote  
Dart270
 Post subject: Re: 170 sustained RPM
PostPosted: Thu Feb 15, 2018 8:25 am 
Offline
Board Sponsor & Moderator
User avatar

Joined: Mon Oct 21, 2002 11:08 am
Posts: 16505
Location: Blacksburg, VA
Car Model:
I would say an old motor would be just fine, as long as oil pressure is good. What is oil P at idle (please give RPM) and at 3000 RPM?

Lou

_________________
Home of Slant6-powered fun machines
Top
   
Reply with quote  
Lobster1
 Post subject: Re: 170 sustained RPM
PostPosted: Sun Feb 18, 2018 9:36 am 
Offline
EFI Slant 6
User avatar

Joined: Fri Dec 16, 2011 4:18 pm
Posts: 345
Location: Portland, OR
Car Model:
Hey Lou, I haven't had a chance to get accurate numbers between work and weather. Hopefully I'll get the car out by the end of the week. I will also check rpm's against GPS speed for accuracy. It will be interesting to see how accurate the online rpm calculator is.

Thanks,
Barnaby

_________________
These ones go to eleven...
Top
   
Reply with quote  
Dart270
 Post subject: Re: 170 sustained RPM
PostPosted: Mon Feb 19, 2018 3:37 am 
Offline
Board Sponsor & Moderator
User avatar

Joined: Mon Oct 21, 2002 11:08 am
Posts: 16505
Location: Blacksburg, VA
Car Model:
I assume you have a tachometer in the car?

Lou

_________________
Home of Slant6-powered fun machines
Top
   
Reply with quote  
Lobster1
 Post subject: Re: 170 sustained RPM
PostPosted: Wed Feb 28, 2018 7:11 am 
Offline
EFI Slant 6
User avatar

Joined: Fri Dec 16, 2011 4:18 pm
Posts: 345
Location: Portland, OR
Car Model:
Morning Lou, At warm idle I have 38 psi oil pressure. And I do have a tach.

Thanks,
Barnaby

_________________
These ones go to eleven...
Top
   
Reply with quote  
Dart270
 Post subject: Re: 170 sustained RPM
PostPosted: Wed Feb 28, 2018 10:52 am 
Offline
Board Sponsor & Moderator
User avatar

Joined: Mon Oct 21, 2002 11:08 am
Posts: 16505
Location: Blacksburg, VA
Car Model:
Sounds like a healthy motor. Run it.

Lou

_________________
Home of Slant6-powered fun machines
Top
   
Reply with quote  
Lobster1
 Post subject: Re: 170 sustained RPM
PostPosted: Wed Feb 28, 2018 9:47 pm 
Offline
EFI Slant 6
User avatar

Joined: Fri Dec 16, 2011 4:18 pm
Posts: 345
Location: Portland, OR
Car Model:
Thanks Lou!

_________________
These ones go to eleven...
Top
   
Reply with quote  
Display posts from previous:  Sort by  
Post new topic  Reply to topic  Page 1 of 1
  [ 9 posts ] 

» » »

All times are UTC-07:00

Who is online

Users browsing this forum: No registered users and 57 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited