Compression Testing Question
Thread Starter
|
Hotshot
Joined: Nov 2006
Posts: 11,287
Likes: 263
From: North of Greenville
Compression Testing Question
I have a brother-in-law who is getting ready to get a 2001-2003 Excursion with a 7.3L PSD in it. He'll be pulling a small race boat with it, but nothing else really. He's been asking me lots of ??'s about the 7.3, and I've been able to help him out so far, but tonight he asked something I need input from you guys on, especially you guys who have spent much more time than I (which isn't much) in wrenching on the engine. Here it is.
How easy is it to perform compression testing on one of our 7.3's? He is pretty sure he'll end up buying frmo a dealer, and wants to do the compression testing before he drops the bills on it. He's pretty savvy with the wrenches himself, but moreso on his 60Hp power heads for his racing boat than with a diesel.
How easy is it to perform compression testing on one of our 7.3's? He is pretty sure he'll end up buying frmo a dealer, and wants to do the compression testing before he drops the bills on it. He's pretty savvy with the wrenches himself, but moreso on his 60Hp power heads for his racing boat than with a diesel.
Post Fiend
Joined: Jun 2006
Posts: 5,497
Likes: 7
From: Central, Al
Compression test is not something the seller is going to want to do, You may get him to ask for a Cylinder Contribution Test, Buzz Test, KOEO, and KOER. If anything is amiss then maybe he could talk then into the compression test.
Senior User
Joined: Aug 2005
Posts: 123
Likes: 0
A blow by test will be much more acurate on this engine than a compression test. International does not even give a spec for compression in their service manuals, although it should be in the range of 450 psi.
Not sure if ford gives a spec.
Not sure if ford gives a spec.
Trending Topics
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Originally Posted by blown99
A blow by test will be much more acurate on this engine than a compression test. International does not even give a spec for compression in their service manuals, although it should be in the range of 450 psi.
Not sure if ford gives a spec.
Not sure if ford gives a spec.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
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
Post Fiend
Joined: Sep 2006
Posts: 5,584
Likes: 0
From: Millbrook Alabama
Originally Posted by F250_
He's pretty savvy with the wrenches himself, but moreso on his 60Hp power heads for his racing boat than with a diesel.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by bdrummonds
Just curious what kinda racing boat is it with only 60Hp power heads. back in the 90's we were makin 360hp out of Mercury 2.5L blocks. Sorry Pete didn't mean to hijack.
Thread Starter
|
Hotshot
Joined: Nov 2006
Posts: 11,287
Likes: 263
From: North of Greenville
Brandon and Kwik. He's racing in the F3 class of what I call little "sprint" boats. It's only his second year racing, but he just purchased what was last year the fastest boat in his class from a guy in Minnesota who is moving up to the F1 class (Donny Lick). The heads are original 60 Hp Mercury heads, but the F3 class only allows very minor modifications. The allowed tolerance for larger bores on rebuilt heads is small, and not enough to let them develop the max Hp you can get from those heads. I think that most of them are running in the 90-100 mph range within the allowed modification limits.
The picture below shows two of these boats in action, the white one being the one my brother-in-law is now racing. At the time of the pic, though, Donny was still racing it.
The picture below shows two of these boats in action, the white one being the one my brother-in-law is now racing. At the time of the pic, though, Donny was still racing it.
Thread Starter
|
Hotshot
Joined: Nov 2006
Posts: 11,287
Likes: 263
From: North of Greenville
OK, guys, thanks for the input on this Compression testing issue. My gut feeling was that it was going to be more involved than my brother-in-law would be able to navigate at the dealer. He's also in the situation where he's probably going to have to fly to the truck location to look at it (he's in Miami and most of the vehicles he's finding are in Texas).
I also told him that the impression I have received from all my time in here is that it probably wasn't a potentially serious issue for a 7.3 with 100-140K miles on it. He's been looking at one with only 65K miles, but has also seen that he can drop $5-6K off the purchase prices to stick with the 100-140K mile engines.
Alan, right now he doesn't have AE or any other type of scanner equipment... are those tests something that the dealer could provide easily enough to justify asking them for it?
I also told him that the impression I have received from all my time in here is that it probably wasn't a potentially serious issue for a 7.3 with 100-140K miles on it. He's been looking at one with only 65K miles, but has also seen that he can drop $5-6K off the purchase prices to stick with the 100-140K mile engines.
Alan, right now he doesn't have AE or any other type of scanner equipment... are those tests something that the dealer could provide easily enough to justify asking them for it?
Post Fiend
Joined: Sep 2006
Posts: 5,584
Likes: 0
From: Millbrook Alabama
Way cool on the pickle forks, I forgot all about the lower classes of those boats. After we had talked at lunch (about Miami and your BIL) I had a mental picture of a 30' Skater Kat with triple 60's hangin off the transom. It just didn't seem right.
Thread Starter
|
Hotshot
Joined: Nov 2006
Posts: 11,287
Likes: 263
From: North of Greenville
Yea... he wants to get a couple of years under his belt in the lower class and work his way up to the Formula 1 Unlimited Mod class later on. I haven't seen one of his races yet, but he is supposedly doing OK for being such a newbie to the circuit.
