True 200 Dyno Base?

[Anonymous]

Anyone have a base run or two on their 200ci motors before they did upgrades? I'm just wondering what the real numbers are because if they are truly 120BHP then i've gone backwards! I have a '66 Mustang with which I did a Cliffy 254 cam, Cliffy head, header and weber 38. I was able to get 109.8, 110.6 and then a high run of 111.3 in 3 pulls today and was over 100mph in 4th gear when it hit 5 grand. I was amazed that the cliffy folks said it would hit peak power between 4200 and 4500 and they were right on the mark each pull I hit at 4500 and then degraded through 5k.

Thanks,
Dave

 

[mustang6]

It sounds like you ran your car on a chassis dyno, which means you have not gone backwards. The 120 HP figure is a factory gross horsepower figure (meaning no accessories like alternator, water pump, P/S, A/C) measured at the flywheel. Most people have found this equates to about 75 - 95 HP at the rear wheels in stock condition, automatic transmissions cars being on the lower end and manual transmissions typically being on the higher end due to their respective parasitic losses.

 

[Anonymous]

There is definitely a big loss on the chassis dyno.

Ask the dyno operator what "correction factor" is needed to convert RWHP to flywheel HP.

 

[Anonymous]

So I'm right where I should be then if there is a hypothetical 15% loss for a manual tranny and a 20% loss for automatics which is the information quote they were throwing around on Saturday at the dyno day. I did see this poor guy in a 1969 Mach 1 (351W) who had an FMX tranny and they guessed that with that automatic and the FMX he was down 40-45% of actual power (Dyno'd at 188 which is low for a car rated at 290HP).

I can tell you this, tongues were waggling and people were impressed that the SIXGNS put out 110HP at the wheels!

btw Car of the day was a Rousch Stage 2 with a KB on it and it was hitting 390HP and the guy was bumming because he was down 30HP from his other chip. I'm thinking, yeah 30HP lol, I could use another 30HP.

 

[Anonymous]

I'm reading the "Horsing Around With The Mustang Six" articles in the Hot Rod archive and I've gleaned the following information from their testing. This is with the stock run through the mod runs in the 1st article only.

1967 Mustang 200ci 1v (Hot Rod Mag test model)

initial run 65 RWHP at 4000rpm 14:1 fuel ratio
2nd run enriched 71RWHP at 400rpm
3rd run with jet drilled out to .067 75RWHP
4th run no air cleaner 76RWHP
5th run with thermactor disconnected (smog) 76RWHP
6th run with a header on 86RWHP
7th run with head work and BF32 plugs 100RWHP

So long and short of it a base 200ci with only minor tuning is getting 75RWHP so i'm feeling pretty spiffy with my 110RWHP run.

Thanks for the link to that archive article section it opened my eyes to the information I was looking for.

Dave

 

[wsa111]

Dave, your HP @ the rear wheels is very good. I bet the stock 67 mustang with a C-4 trans is lucky to get 55-60 to the rear wheels.

With a mild crane cam & some head work, 68 distributor & a 215 CFM pony carb I got 85 HP & that was with fuel starvation & ignition breakup, so I know more was to be had.

Since I have done extensive mods I don't have any dyno figures to post yet. The seat of the pants feel is like night & day. This fall when the weather cools down I will 1/8 mile time it & also dyno test it. William

 

[MustangSix]

Using some vintage test and vehicle data by Road and Track and others, 65-66 Mustang with a 200 is about 65-70. Net hp at the crank would be about 90-95 hp. You're not doing bad at all. You've double the output of the stock engine.

 

[Anonymous]

I once had two 1970 Mavericks, the 170 "U" code engine was 105 HP,
and the 200 "T" code was rated at 120 HP.

 

[65coupei6]

Dave, what's up! Your club had a dyno day? You should have emailed me.

You are basically right on the money with your setup. Good work!

You guys should see his car. Nice piece of work. It won the 6 cyl. award at my club's car show.

 

[Anonymous]

I would like to see a sticky ( or even a forum like "braggin' rights" )with various combos that have been dynoed and their results....

I think it would be a great reference to those who are looking for the easiest power upgrades, or best "bang-for-the-buck" combos.