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Old 04-18-2009, 03:12 PM   #1 (permalink)
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Dyno Run 67 Mustang 200 6 cylinder

I am mainly a V8 man, but i have a 67 mustang which came as a six cylinder.
I ran the deal on a dynojet chassis dyno.
The six has many mods done, but i was suprised at the output.
145 HP at the wheels is like 180 @ the flywheel.
For 204 " that isn't bad, considering the old school cylinder head.
Ran my 67 mustang with the old engine 4-11-09.
Temperature was 73 degrees F & @ 45' above sea level.
Engine is a 204" engine with a 274 camshaft & a holley 4412 carb with annular discharge nozzles direct mounted on a 80 modified head with 1.6 roller tip rockers. See my profile.





video & audio of run

A/F was 13.2 WOT
The dyno is a new dynojet unit.
I wish i could have run the 1.65 yella-terra full roller rockers.
Because of an oil leak at the lr of the engine i had to remove them.
In the future i will block the oil supply to the head by plugging the oil galley at the left rear of the engine.
The engine was definitely stronger with the 1.65 rockers.
I bet i lost at least 5 HP by having to go to the 1.6 roller tip rockers to releave the full oil pressure at the headgasket sealing area.
The 274 cam has served its purpose & now i am ready to step up to a very aggressive camshaft which will require valve springs in the 140# seat pressure area.
The log head hopefully will respond to a more aggressive camshaft by camshaft innovations for more power.
The secret is a matched combination of componets & the present camshaft & the head are limiting the full potential of this engine.
To use the CI head with valve lifts in the .570" area it will require longer valves for a higher spring height for the increased lift & clearance between the retainer & the valve seal-guide area.
When the CI head was designed no one ever thought of using valve lifts in the .570" area.
Overall i am very satisified with my power results.
If i richen the mixture to say 12.8 i may loose 5 HP but will gain 5-10 ftlbs of torque.
Only track testing will be the final answer. Bill
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Last edited by wsa111; 07-09-2009 at 06:25 PM.
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Old 04-18-2009, 05:11 PM   #2 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

nice combo how does it run
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Old 04-18-2009, 06:08 PM   #3 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

Butch, i love to run 289's with a 2 bbl.
With a 4bbl thats out of my league. Bill
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Old 04-18-2009, 11:17 PM   #4 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

That looks like a pretty good effort for a 200ci six.... and its nice to have some REAL figures instead of all this 'guess my hp' crap thats on here lately.
Will look forward to seeing what your changes produce.

The sound on that video takes me back abit I'll tell ya !!
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Old 04-18-2009, 11:31 PM   #5 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

You should dyno it without the K&N flow top lid and put a chrome lid on it. From what I've experienced you gain more performance with a chrome lid vs the flow thru lid. Something having to do with the air flowing turbulence. I know I won't go back to a flow thru lid. The engine feels much stronger with the chrome lid.
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Last edited by Spali32; 04-20-2009 at 12:08 PM.
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Old 04-19-2009, 06:26 PM   #6 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

I will go back with my chrome lid for the air cleaner.
The 14" X 3" filter is an overkill for my small engine, so i sure will not starve the engine for air.

On a larger engine like your 347" airflow turbulance could cause a power loss.

Have you seen any documentation on the negitive affects of the K&N top flow air cleaner cover??? Bill
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Old 04-19-2009, 07:10 PM   #7 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

I'm almost positive there's be no negative effects off a top flow air filter... If there WAS, then people would STOP taking their air filter off completely on the track...

That's what I think

I LOVE those 200 #'s! and at 204" that mean's your +.090 on the bore. I'm at +.040 and am sitting on 202.3 CI. Not HP #'s because I've not finished my head yet.

Nice looking engine!
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Old 04-20-2009, 11:50 AM   #8 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

That's a nice little 6 cylinder. I'll also be very curious how the new mods turn out. What is a safe rpm for that engine?

Some say properly designed air filter assembly and clean filter will be faster than no air filter at all on a running car. Some carb guys say carbs do not like to get air directly from the top. Some also say the underside of the flow top lid causes turbulence to the air coming in from the sides. Who knows? I believe the flow top lid is a marketing gimmick for those forced to run a short filter assembly for hood clearance and don't want to feel like they've lost cfm. They sure have sold a lot of them.
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Old 04-20-2009, 11:55 AM   #9 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

I want one because it looks cool and I HATE chrome air cleaner lids...
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Old 04-20-2009, 12:09 PM   #10 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

I'd give you mine......FREE....but I already sold it.....
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Old 04-20-2009, 01:28 PM   #11 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

289nate, peak power is in the 5200-5300 rpm area, i shift at 6200 so after the upshift i'm right at peak torque & approaching the start of the power curve, at least previous runs have been better at that rpm.
With the new cam from Jay @ camshaftinnovations top rpm will be 6700 but maximium power will be still at 5200 & peak torque at 4300 and 6300 rpm's is his recommendation for a shift point.

My hold up is to see if i have enough spring seat thickness in the head otherwise i will have to go to longer valves & pushrods to get the proper valve spring installed height.

I already put my chrome air cleaner cover back on so i'll see what happens. Bill
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Old 04-30-2009, 02:40 PM   #12 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

K&N top flow air cleaner cover???
Does anyone or has anyone noticed a difference with or without the K&N top flow air filter & has track times or dyno runs to prove it.
K&N technical say it should make no difference, but they are in the market to sell their products.

I hate to waste $$$ on a dyno run to test an air filter cover. Thanks Bill
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Old 04-30-2009, 02:48 PM   #13 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

Cool Little Motor.
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Old 06-03-2009, 01:00 PM   #14 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

I was just reading through a back issue of Hot Rod last week and they did a big comparo of different filters. The K&N flow top DID give a performance increase, IIRC. I'll try to dig up the issue and post the exact details for you guys.
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Old 06-03-2009, 08:45 PM   #15 (permalink)
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Re: Dyno Run 67 Mustang 200 6 cylinder

From my experience, the motor responded better with a chrome lid vs the flow thru top. The flow thru lid seemed to disrupt the turbulance of air sucking into the carb.
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