Wanted: 4.7L dyno sheets
#1
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Thread Starter
Wanted: 4.7L dyno sheets
Took delivery of a plethora of MB offset woodruff keys today. Doing a TB/WP replacement along with a bunch of other stuff on an '84 A/T and thought I'd play with the valve timing a bit.
I'm going to retard the timing first since the car will be going to a track event next month. We'll dyno the car and then after the track event I'll probably advance the timing so the car will be more responsive around town.
This car doesn't have a baseline, so I'm wondering if anyone can post a 4.7 liter dyno graph here so I'll have an idea of what to expect.
Thanks,
I'm going to retard the timing first since the car will be going to a track event next month. We'll dyno the car and then after the track event I'll probably advance the timing so the car will be more responsive around town.
This car doesn't have a baseline, so I'm wondering if anyone can post a 4.7 liter dyno graph here so I'll have an idea of what to expect.
Thanks,
#3
Administrator - "Tyson"
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Whatcha gonna do with those extra keys?
#4
Rennlist Member
I have a ton of 84 runs. stock, mine was pretty weak, with only headers, it was 188hp. with the 3.5" exhaust, it went to 200rwhp. then, with the euro intake and euro cams, 235rwhp. with the fuel regs and some slight tuning, 243rwhp.
I always was comparing my car to one that was a little stronger from the start. it was near 220rwhp where mine with the same mods was 200rwhp.
mk
I always was comparing my car to one that was a little stronger from the start. it was near 220rwhp where mine with the same mods was 200rwhp.
mk
#5
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Thread Starter
hacker wrote:
I was probably going to hold on to them. I bought two with the largest offset and one of each of the rest. Depending on how this goes, we may have a local OB ('79 5 speed) that may be interested in a little powerband adjustment as well.
I plan on keeping a set around so we can offer the valve timing tweak to any of the older cars we do TB/WP replacements to.
If you want a set hacker let me know, the cost about $6 each. They do need to be modified for the 4.7 (I think they work on the 4.5's as is). The MB woodruff keys are taller (go deeper into the crank) than the stock 4.7 square key. I'd say about 35% of the rounded portion of the key needs to be taken away. I haven't measured, but if the stock key is 4mm tall, the woodruff key is probably about 6-7mm tall.
Here's a (lousy) pic:
Mark,
Can you post whatever dyno sheets you have for stock runs on your '84, or any other stock 4.7L?
thanks.
Whatcha gonna do with those extra keys?
I plan on keeping a set around so we can offer the valve timing tweak to any of the older cars we do TB/WP replacements to.
If you want a set hacker let me know, the cost about $6 each. They do need to be modified for the 4.7 (I think they work on the 4.5's as is). The MB woodruff keys are taller (go deeper into the crank) than the stock 4.7 square key. I'd say about 35% of the rounded portion of the key needs to be taken away. I haven't measured, but if the stock key is 4mm tall, the woodruff key is probably about 6-7mm tall.
Here's a (lousy) pic:
Mark,
Can you post whatever dyno sheets you have for stock runs on your '84, or any other stock 4.7L?
thanks.
#6
Here's some from Trishas 83 and jasons 84..way back from 2002 at one of our dyno days..
Later,
Tom
P.S..my old 84 5sp did 188 hp and 240 torque.at the first dyno day we had..but can't find the curve...
thanks.[/QUOTE]
Later,
Tom
P.S..my old 84 5sp did 188 hp and 240 torque.at the first dyno day we had..but can't find the curve...
thanks.[/QUOTE]
Last edited by Tom. M; 12-14-2012 at 05:12 PM.
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#9
Rennlist Member
you mean, restrictive beasts? look at the arc of that power curve. no reason but the restriction and cams that give it a diesel like ,4500- 5000rpm HP peak!
mk
mk
#14
Rennlist Member
you mean a lot of CAMlift, duration, retard, intake opening and a few other things.
Mk
Mk
Originally Posted by atb
A little cam retard should help with that.