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Dyno Test Execution and Results

11:34
47:33
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At 11:34 in

Lake Speed's Ford C3 NASCAR Engine: Time Capsule of 90s Technology! (Dyno & Full Teardown)

What happens here

After confirming the engine is warmed up and leak-free, the dyno test is performed. The engine makes approximately 456-480 horsepower. The dyno operator notes that the engine has a significant amount of blow-by, measured at around 7 CFM, which is double what a modern, brand-new engine would typically produce (2-2.5 CFM). Additionally, moisture is observed in the blow-by, indicating a potential head gasket issue. The recorded horsepower is significantly lower than the 730 hp that Lake Speed Senior claimed the engine originally produced, and even lower than a comparable modern 383 small-block Chevy. The dyno run also reveals that the engine did not respond significantly to changes in timing, further indicating internal issues affecting performance.

Goal: Record and analyze engine performance data.

Tools and materials

  • Computer Monitors — Displaying real-time engine data and graphs
  • Dyno Control Panel — Operating the dynamometer and making adjustments
  • Engine Dyno PME Engines — Measuring engine performance and displaying results

What they say

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[Music] did you add some timing to it yeah five degrees so is it 35 now yeah does that say 456 457 yeah that's an average between 6 000 and 8 000 this is the number it makes where this cursor is that's the peak number okay so it made 475.9 and like that it made 476 but more time and depending upon the motor sometimes they just don't respond it seems to be a little bit off from what your dad thought it was you know i remember him running this engine up at vir one time and the other guy behind me being able to get about eight car lengths lying on the straightaway i think i know why now it could be like a 312 if it was running in a trans am as it should be the publication does it sound like a smaller motor to you it's kind of hard to tell it doesn't act like a small motor because small motors usually have everything upstairs but it's got a pretty reasonable amount of work yeah it falls off really [Music] only after a thousand stuff do you think it's being like not making enough power because it's wounded from being erased without being refreshing five six times or sitting for 15 years exactly the sitting for a long time definitely hasn't helped it me i'm watching the blow by out there that i think that's probably the biggest telltale is that each of those things is uh one cfm right dennis it starts at the bottom at one and goes all the way up yeah that little like white white marker right yeah so make a sweep let him record it real quick and we'll talk through and show you what we're seeing here because right now it's bouncing around 2 cfm as soon as he loads it it's dropping up to almost 4 cfm now let's watch it over right here all right almost to five cfm i think that's a lot yeah just give you an idea a couple weeks ago we were at ron shaver's place doing some testing on some new rings for us one millimeter ring we saw two cfm of blow-by on a brand new engine just doing break-in work and that would go down once it's seeded and broke in right yeah like we've seen it as low as one cfm on a dry sump engine that's not even a wet song we can get it that's no crank ace vacuum none of that stuff just a one millimeter one millimeter two millimeter ring package and we're getting two two and a half cfm of blow by this thing is double that so how much a rule of thumb on something like this how much power is one cfm blow by costing you hard to really put a number to that but i can tell you this thing made what's almost 480 right there just about okay it's that little…

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