www.the351cforum.com

ALL things related to the Ford 351C
It is currently Sun May 22, 2022 6:15 am

All times are UTC - 5 hours




Post new topic Reply to topic  [ 45 posts ]  Go to page Previous  1, 2, 3, 4, 5
Author Message
 Post subject: Re: lack of performance
PostPosted: Mon May 03, 2021 3:24 am 
Offline

Joined: Mon Oct 29, 2012 9:05 am
Posts: 2891
No way to know what lash should be if you don’t know what the cam is. You can’t know if they’re .010” loose because solid roller lash depends on the lobes and I’ve had cams everywhere from .010 to .028”.

I don’t think you know the most important things about the engine, right? Cam, head work, compression?

_________________
Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


Top
 Profile  
 
 Post subject: Re: lack of performance
PostPosted: Mon May 03, 2021 9:02 pm 
Offline

Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
Yeah, compression of 11-12:1 is what I was told by the guy who knows the engine, but that’s it.
If I got a boriscope to check things out further, will look at the pistons, and if I pull the carb, will I be able to see if the heads are ported?


Top
 Profile  
 
 Post subject: Re: lack of performance
PostPosted: Tue May 04, 2021 5:58 am 
Offline

Joined: Mon Oct 29, 2012 9:05 am
Posts: 2891
A one point compression swing is a big difference, IF what he told you was correct.

I know you're trying to figure out as much as you can without going in the engine, but the nuts and bolts of it is that you won't be able to determine much at all without doing so.

A borescope may give you a part number of the piston, but it won't tell you how far down in the hole it is (or out), or the size of the combustion chamber volume.

In the same sense, looking down the intake won't tell you if the heads are ported, or to what extent. Some guy may have got in there with a sand roll and it may "look" ported, but he could have actually hurt the flow or not changed it at all.

That engine needs to be torn down and checked out if you're not pleased with it.

_________________
Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


Top
 Profile  
 
 Post subject: Re: lack of performance
PostPosted: Tue May 04, 2021 8:43 am 
Offline
User avatar

Joined: Mon Oct 29, 2012 2:39 pm
Posts: 1726
FWIW - I've only bought a few "somebody put together" motors and most - unfortunately - were a pig in a poke. Hope yours is not. But the first thing I do is tear it all down. An example was the 351W that came with the 70 Mustang we bought in the way back. It was gone through by a local shop, updated with an Ed cam, intake and carb. Way down on power - car ran like 10.50s in the 1/8. Guy sold it because it was so slow, even after throwing money at it. I pulled the motor once we got it to the house. #4 and #8 pistons came out dropping pieces of the second rings on the floor and every hole was .050 or better down the bore. Note - it never smoked or gave any indication it was hurt - it was just a weak sister. Kept the block, rods and crank, sold the DOOE heads. Put the 302 in the Mustang, no other changes, and it ran 8.40s. So yea - I'd be taking a wrench to the thing. Measure and document all. At worst, it'll cost gaskets.

Oh, and under the nice carpet the floors were swiss cheese - so it was a total package LOL.

_________________
Chris - Merkel, TX
http://raceabilene.com/kelly/hotrod
"Owner built, owner abused."


Top
 Profile  
 
 Post subject: Re: lack of performance
PostPosted: Tue May 04, 2021 8:05 pm 
Offline

Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
Good advice and duly noted.
For now, I’ll just enjoy it for what it is til I leave and attack the engine in July.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 45 posts ]  Go to page Previous  1, 2, 3, 4, 5

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 4 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 Group