Smashed Plugs on fresh re-build, any advice?
11-17-2014 | 05:01 AM
#71
Registered
Joined: Aug 2011
Posts: 2,733
Likes: 8
From: bel air, md
Very true. And an easy way to tell if this is happening is look at the intake runners / ports in the head if there is evidence of carbon then the cam, exhaust or cam &exhaust aren't right.
11-17-2014 | 07:37 AM
#72
Gold Member
Joined: Oct 2005
Posts: 11,691
Likes: 217
From: Olmsted Falls,Ohio Marblehead,Oh
Following is just conversation:
Blow thru carb's aren't the most trustworthy thing on the open water.
I'm a diehard carb guy, but with blowthru's I personally would go EFI/ Agai, just personal opinion and conversation.
Basically I'm waiting for full report of this engine before I listen to what may have happened without evidence.
Blow thru carb's aren't the most trustworthy thing on the open water.
I'm a diehard carb guy, but with blowthru's I personally would go EFI/ Agai, just personal opinion and conversation.
Basically I'm waiting for full report of this engine before I listen to what may have happened without evidence.
11-17-2014 | 07:40 AM
#73
Gold Member
Joined: Oct 2005
Posts: 11,691
Likes: 217
From: Olmsted Falls,Ohio Marblehead,Oh
Does not take much to have leaks in the intercooler, pressure check it, my buddy has gone through 2 of them over 7 years... luckily he has tons of monitering on the boat and saw things not right before it failed..
11-18-2014 | 10:45 AM
#76
Fast Singles Club
Joined: Oct 2011
Posts: 4,042
Likes: 490
From: Raystown Lake , Pa.
Exactly what I found when tearing down my HP500 . Wonder what was left on the table running the stock Gill exhaust .
Last edited by the deep; 11-18-2014 at 07:56 PM.
11-19-2014 | 06:16 AM
#77
Registered
Joined: Aug 2011
Posts: 2,733
Likes: 8
From: bel air, md
I would imagine a good bit. When this occurs the cylinder is not getting cleaned out. A good clean mixture can't get into the cylinder and its going to re-burn the already spent charge. There are many factors that can cause this to happen bad valve springs/ valve job, exhaust, cam cylinder head ect ect. This phenomenon really has me wondering how beneficial it would be in a custom build to bolt the exhaust on the head and flow the head same with the intake. Based off those numbers then cam the motor. I think this would give the best package...
11-19-2014 | 10:58 AM
#78
Fast Singles Club
Joined: Oct 2011
Posts: 4,042
Likes: 490
From: Raystown Lake , Pa.
I would imagine a good bit. When this occurs the cylinder is not getting cleaned out. A good clean mixture can't get into the cylinder and its going to re-burn the already spent charge. There are many factors that can cause this to happen bad valve springs/ valve job, exhaust, cam cylinder head ect ect. This phenomenon really has me wondering how beneficial it would be in a custom build to bolt the exhaust on the head and flow the head same with the intake. Based off those numbers then cam the motor. I think this would give the best package...
11-19-2014 | 11:03 AM
#79
Registered
Joined: Nov 2004
Posts: 14,106
Likes: 3,692
From: On A Dirt Floor
I would imagine a good bit. When this occurs the cylinder is not getting cleaned out. A good clean mixture can't get into the cylinder and its going to re-burn the already spent charge. There are many factors that can cause this to happen bad valve springs/ valve job, exhaust, cam cylinder head ect ect. This phenomenon really has me wondering how beneficial it would be in a custom build to bolt the exhaust on the head and flow the head same with the intake. Based off those numbers then cam the motor. I think this would give the best package...
One thing that does make sense to flow on an exhaust is the muffler...if it has one..
Edit in: a 'spent' charge cannot reburn. It does, however, occupy space that fresh air/fuel should be occupying, and thus will be down on power.
11-19-2014 | 11:06 AM
#80
Registered
Joined: Nov 2004
Posts: 14,106
Likes: 3,692
From: On A Dirt Floor
BTW: I learned the hard way many years ago that I was losing almost 40hp on a mild 375-400 SBC.
It was the headers - wanna guess how ?
It's something I have never overlooked since then and I have seen it as an issue almost a dozen times since then.
It was the headers - wanna guess how ?
It's something I have never overlooked since then and I have seen it as an issue almost a dozen times since then.
