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74 bus with type 4 engine not running over 45-48mph
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HITE
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PostPosted: Wed Jul 11, 2018 3:57 pm    Post subject: 74 bus with type 4 engine not running over 45-48mph Reply with quote

So I finally got the bus running about a week ago. Glorious feeling. But now I feel like I got some ripples to iron out.

I took it for a ride today to advanced auto, about 6.5 miles away. Then told my friend who owns mainly split window buses said a type 4 engine should be hauling ass.

Basic cruising speed that I got it to was about 45-48 MPH.
Light uphill she drops down to about 35-40mph (without dropping her down to 3rd gear to pick up speed)
Downhill I get to about 50-55( soft hills )

I want to say the accelerator is about an inch off the floor to keep up the 45MPH cruising speed.

I plan on changing the oil this weekend, and plan on readjusting the valves this Sunday.

I replaced the heads. And gaskets, pushrod tubes, etc. . Still leaking a bit of oil but not a ton.

Any help. Or a check list of things to go through would be awesome.
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busdaddy
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PostPosted: Wed Jul 11, 2018 4:09 pm    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

Have you ever done a tune up and compression test? When it's idling and you pull each plug wire out of the cap is the drop in RPM the same before you replace it and move on to the next one?
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PostPosted: Wed Jul 11, 2018 4:28 pm    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

Maybe compared to a splittie with reduction boxes a Type 4 Bus hauls ass, but by no other reasonable standard would anyone else say it hauls ass Very Happy
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Tcash
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PostPosted: Wed Jul 11, 2018 4:52 pm    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

Welcome to TheSamba, Bay Window Bus Forum!

73-79 NEWBIE

Tcash wrote:
Every Type IV engine owner should know this!!!

If you over tighten the Oil Strainer bolt, you will brake the engine case!
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There is a Oil strainer in there.
TORQUE THE STRAINER BOLT TO NO MORE THAN 9 FT. LBS.


Tcash wrote:
Here is a little information. Good Luck

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Tcash
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PostPosted: Wed Jul 11, 2018 4:54 pm    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

Tune up

Timing

Put a brick on the Gas pedal and go back and make sure the Throttle is all the way open.

Good luck
Tcash
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TomWesty
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PostPosted: Wed Jul 11, 2018 11:35 pm    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

Tcash wrote:
Tune up

Timing

Put a brick on the Gas pedal and go back and make sure the Throttle is all the way open.

Good luck
Tcash
With the ignition off I assume? Laughing Cool
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PostPosted: Thu Jul 12, 2018 8:52 am    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

Type 4 should be easy to cruise at 65 mph, and light hills should not slow it down to less than 55 mph.

Mine was running at the speeds you mention on 2 cylinders with zero compression in #3.
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PostPosted: Thu Jul 12, 2018 10:52 am    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

Tcash wrote:
Tune up

Timing

Put a brick on the Gas pedal and go back and make sure the Throttle is all the way open.

Good luck
Tcash


I had this once.... what a night and day difference once I took the slack out, and full throttle really was....
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pioneer1
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PostPosted: Thu Jul 12, 2018 12:24 pm    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

Can we assume the brakes are not sticking?
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PostPosted: Thu Jul 12, 2018 1:15 pm    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

aerosurfer wrote:
Tcash wrote:
Tune up

Timing

Put a brick on the Gas pedal and go back and make sure the Throttle is all the way open.

Good luck
Tcash


I had this once.... what a night and day difference once I took the slack out, and full throttle really was....



^do this next^
you may need a new linkage & rod under your gas pedal. They get ovalled
out & the rod goes cock-eyed over the years, wind up with 60% throttle.: (
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Tcash
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PostPosted: Thu Jul 12, 2018 9:41 pm    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

TomWesty wrote:
Tcash wrote:
Tune up

Timing

Put a brick on the Gas pedal and go back and make sure the Throttle is all the way open.

Good luck
Tcash
With the ignition off I assume? Laughing Cool


If the engine was on, you'd be moving fast to check that throttle cable I'd bet.
Let's try it with the engine off though.
Laughing
Tcash

In High School shop class, this kid was adjusting the idle in drive on a Ford Mustang. Let me paint the picture for you.
Cars in drive parking brake on, kid sitting in the engine bay adjusting idle.
As we always did in those days, he reaches over to blips the throttle to clear the carb.
The car lurches forward stopping inches from the cinder block wall in front of it. He looked at me with eyes bigger than the Owl that couldn't get to the bottom of a Tootsie pop.


Last edited by Tcash on Sat Jul 14, 2018 9:09 am; edited 2 times in total
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HITE
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PostPosted: Fri Jul 13, 2018 6:19 am    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

busdaddy wrote:
Have you ever done a tune up and compression test? When it's idling and you pull each plug wire out of the cap is the drop in RPM the same before you replace it and move on to the next one?


I replaced the heads. (Both) because I had bad compression on #2. Also replaced the pushrod tubes. I can re-check compression. But before I replaced the heads the bus wasnít getting above 20mph. Would barely make it up a hill. Hopefully thatís not an issue. Confused
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Randy in Maine
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PostPosted: Fri Jul 13, 2018 6:38 am    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

When you are setting the timing, keep your timing light on there as you rev the engine up and down a few times to see if it really is advancing and retarding correctly.

The centrical advance in the distributor might be all crudded up with dead grease.
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PostPosted: Sat Jul 14, 2018 8:41 am    Post subject: Re: 74 bus with type 4 engine not running over 45-48mph Reply with quote

Tcash wrote:
TomWesty wrote:
Tcash wrote:
Tune up

Timing

Put a brick on the Gas pedal and go back and make sure the Throttle is all the way open.

Good luck
Tcash
With the ignition off I assume? Laughing Cool


If the engine was on, you'd be moving fast to check that throttle cable I'd bet.
Let's try it with the engine off though.
Laughing
Tcash

In High School shop class, this kid was adjusting the idle in drive on a Ford Mustang. Let me paint the picture for you.
Cars in drive parking brake on, kid sitting in the engine bay adjusting idle.
As we always did in those days, he reaches over to blips the throttle to clear the carb.
The car lurches forward stopping inches from the cinder block wall in front of it. He looked at me with eyes bigger than the Owl that couldn't get to the bottom of a Tootsie pop.
Good thing he was in the engine bay! Shocked
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