toyospearo

A friend of mine called me a few weeks back and he asked me to look at his motor. He has a motor similar to mine.
He was having power issues. He thought with the hardware he bought for this 82 4 x 4 it should have quite a bit more power.
This is the rundown
1982 22r
fresh motor bored 60 over (2367 miles)
stock OEM head rebuilt (valve job) with the new motor
Melling 260 cam new
new valve adjusters
Straight pipe no cat stock muffler
strange aftermarket header with no markings on it
NEW Weber 32/36 DGEV carb
New dual row timing chain, oil pump, waterpump
Radiator new
truck has a 2 inch suspension lift with 31 10x50 15's
LCE adjustable cam gear
Cam gear is set at 2 degrees retarted
distributer is 0 degrees with vac advance off


ISSUE -
From the get go my buddy said this truck doesn't have the power it should. He toyed with the cam timing and adjustable cam gear but still no change.
The truck bogs down up light grade hills.
Not responsive on the lower end or upper end - punch the gas and it slowly climbs up the rmp with really no punch.
Gas milage is bad! I am monitoring it for him and as of now we filled the tank and it is at half and only 63 miles on the clock.
I did a compression test and all four cylinders read 167
I have checked and rechecked for intake leaks and there are none. The rig idles fine no issue.
valve lash 8 and 12 cold
One thing. He tested the compression a few weeks ago and it was as follows : 138 in #1 137 # 2 151 # 3 45 # 4
He pulled the head and had a valve job on the head. He put it back on and the compression is 167 across. BUT the lack of power is still there. I have checked the teeth and it does not appear any are off on the dizzy or the cam gear.
I am wondering if that header might be an issue. I have no idea who made it or where it is from.

I have no idea what to do next. I am in need of someone who would know what to do next...
Here is the header. Could this be the culprit? Bad airflow? I am at a total loss.

xxxtreme22r

what is final timing after vacuum line is on and at an rpm above say 1200 rpm. ? Which vacuum line is he running off of off the distributor? What is he getting for gas mileage? 4.10's with the 31's? Is he correcting for tire size change in the gas mileage calculations? How did he tune the carb? Same way I showed you? Confirm vac leak at carb base by spraying carb cleaner?

slacker

iTrader: (1)

and how big is the rest of the exhaust piping ?


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RMA

The cat and muffler arnet clogged .not that i know much about carbed trucks , just thought id throw out the easy stuff

xxxtreme22r

well the cat not clogged is a given since it don't have one, but still has the muffler. Doubt it would cause an this issue as if it were the exhaust manifold header in his case would end up glowing.

toyospearo

Another question I have is how many miles to a tank of gas on the short bed 1st gen. I know the tank is 13.5 gallons. What is the stock average overall milage from a full to empty tank?
He says you cant go 120miles on a tank. That seems low low to me.

somewhere around 15 is the final timing around 1200 rpm
He has the vacuum line running from the webber to the line closest to the radiator on the dizzy the back line is plugged.
yes 4.10's with 31's
he is correcting the milage for tire size.
No vacuum leaks anywhere
I might need to retune the carb. I did it for him per what you said. I also looked over the weber specs.
Do you have good link to proper tuning of that carb???


Stock 2 1/4 I think. It is the same as mine.

xxxtreme22r

newbie sticky section, just posted it yesterday. I might just add it to my sig. lol.

xxxtreme22r

What was done with all the vac hoses that got deleted from the weber install?

1styota4X4

have you checked to make suer the dist is working properly and advancing the timing when its under vaccume?

xxxtreme22r

30 degrees sounds about right. I'd have to double check mine. And once again it's dark outside when I need to go to my truck to answer a question. hahaha.

toyospearo

capped off on and around the intake.
The other ones are all off to the side chillin.
And he told me this is the 2nd dizzy he put in it since this problem. Nothing changed. I pulled the vac off and blew into the dizzy vac bubble and it was clicking/moving.

I will get some pics of the vac lines. Everything is capped off from what I could see. I squirted propane and carb cleaner all around. There is no intake or vacuum leak.

toyospearo

Blowing into the vac bubble on the dizzy and hearing the click is the only way I know to check if it is working. Is there a different way to tell?

xxxtreme22r

weber regulated to 3.5 psi? Doubt it's the problem. Not a half tank use over 65 miles. Which would be roughly 8 gallons = 8 mpg without tire size correction and 9mpg with tire size correction.

yeah if it wern't advancing your final timing with the vacuum line on and above 800 rpm you would not see 30 degrees.

slacker

iTrader: (1)

2 big of "piping" would ..

what size is the exhaust pipe ?

xxxtreme22r

Stock muffler would be about 1.75" piping right? Even if the rest of the piping was 3" it's gonna get bottle necked in the muffler which would create just about the same amt of back pressure yeah?

toyospearo

it is the same diameter as the stock piping. He ordered a stock muffler a while back and matched the pipe size from the header back to the muffler and out.

slacker

iTrader: (1)

no .. "flow" is interupted , creating un wanted back pressure


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toyospearo

I am thinking there is an issue with the webber. He told me before he put the Weber on he had this power issue and as a result he bought the Weber. I dismissed it initially but now I don't know what else is going on. With compression that good and no intake leaks I just don't know

toyospearo

This is why I thought the header might be it. But he told me on his old motor there was more power than on this new one and this new one is the same header.

slacker

iTrader: (1)

ok .. so .. stock exhaust ..

it could be restricting the power band ..


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