54greg

Had my 66 dyno tuned today. The RWHP is 216 and RWTQ is 267. Is this normal? Did not find any additional hp but the engine is a lot smoother. Also my timing was at 42 originally so we reset it at 38. So with the timing adjustment the temp went up a few degrees. Does all this sound about right?

Greg

Donny Brass

you are down horses....

if the engine is sound, with good compression, you are short at least 50horses, 42 degrees of timing is too much...

did they measure the a/f ratio or give you brake specific readings ?

54greg

The avg A/F readings are 11.0 and the max A/F is 11.4

Donny Brass

that is pretty fat... what did the plugs look like ?? was this just a few pulls, or were you tuning ?

54greg

The plugs have about 3K miles on them and they look new. That was just a base line pull. Then he re jetted the carb adjusted the timing and mixture and did another pull. HP was the same for both pulls but again the motor was alot smoother with the adjustments. He said with another carb with mechanical secondaries it would easily add 20 hp.

Donny Brass

snake oil... the 3367 carb on your motor is fine up to about 400 horses at the flywheel.

how long have you had the car, and what has been done to it ?

54greg

It no longer has the 3367. A past owner messed it up and I have not had it rehab ed yet. The car currently has a holley avenger. I believe its a 600 cfm, vacuum secondaries with electronic choke. The motor was rebuilt about 20K miles ago, again by the past owner. I purchased the car about 2 years ago. Motor has good compression in all cylinders, a hydraulic cam otherwise appears stock with high volume oil pump.

Donny Brass

the avenger is probably not to blame, either...

I'd start in the distibutor, then the carb.

there is a lot of horses won and lost in the those two component.

54greg

Theres no substitute for experience. Thanks for you help Donny

Donny Brass

try looking up Lars, he does a phenominal job on distrubutors....

if the search function works, that is

Vet65te

54Greg - I think most of us would see your numbers as a bit below what would be expected based on your original title which says 327/350 but it's starting to sound like there's a possibility that things have been changed. The 350 horse 327 had 11 to 1 compression and a 222/222 duration cam, any idea if that's still the story or has someone detuned it a bit which might explain the lower than expected dyno numbers.
Did the previous owner leave you any receipts or spec sheets for the engine build?
Mike T.

54greg

I do have receipts and will look up the data.

Greg

54greg

Checked my receipts- 327/350 hp cam-202/160 double hump heads with 9:1 compression pistons. With the lower compression maybe the dyno results make more sense.

54greg

I've always put 91 octane in my car. If it has only 9:1 compression is 91 even needed?

Vet65te

The lower compression would lower the numbers a bit, but maybe not 40 or 50 horsepower worth. What's the overall condition of the engine since it's not exactly fresh? Anyone done a compression test or leak down test to see how it's sealing? There have been a few posts lately about dyno results, you might want to look up one recently submitted by Jerry Bramlett. That A/F number is very rich, what jet numbers were in it to begin with and what did they change to them to afterwards? Any change seen? The bottom line is there could be a number of things associated with those numbers of yours including the humidity at time of testing, the dyno itself and so on. Once you factor out the loss through the drivetrain you're really probably looking at an engine number around, what 250/260 and that's maybe not that far off what your's might actually produce. I also meant to ask if you're running the stock exhaust manifolds or headers and whether you have under the car exhaust or side exhaust.
Mike T.

54greg

I did a compression test/leak down in the last 5K miles. I don't remember the #'s be everything checked out great. I'm running stock ram horn manifolds with under the car exhaust. Thanks

Greg

AZDoug

Get your WOT A/F up to about 12.5:1 and gain 20-30 HP.

You want your part throttle cruise about 14:1-14.5:1, at about ~50 HP at say 2500 RPM, so adjust your primary jets to get that, then adjust the secondary jets for the full power A/F ratio

Doug

wmf62

that is probably too much cam for 9:1 compression...
Bill

Donny Brass

that is not really too much cam, but way to much duration in the cam, your dynamic compression will be anemic....

my engine is almost 12:1 static and I can run on 93 octane all day long, the cam bleeds off compression.

I would do a cam swap to match your internals, it's the only way you will be able to compensate for the lost compression.

Or forget the numbers and be happy with a car that runs just fine

wmf62

then that sounds like too much cam to me...
lol
Bill