1 1 1 1 1 1 1 1 1
1 1 1
1 1 1 1 1 1 1 1 1
FAQ :: Search :: Memberlist :: Usergroups :: Register
Profile :: Log in to check your private messages :: Log in

74 Westy: am I burning it up?

 
Post new topic   Reply to topic    AthensVWClub.com Forum Index -> Tech Talk
View previous topic :: View next topic  
Author Message
mackay



Joined: 19 Oct 2011
Posts: 73
Location: North High Shoals, GA


PostPosted: Sun Jun 16, 2013 7:21 pm    Post subject: 74 Westy: am I burning it up? Reply with quote

I drove my 74 bus to Lake Wales, FL (near Orlando) last week. Came back the next night. The outside air temp got into the mid 90s, and the cabin temp was over 100 until well after the sun set. I stayed off the highways and limited my speed based on cylinder head temperature. I kept it below 410, which is where I've set the CHT gauge to start blinking. That meant speeds from the high 40s to mid 50s. In the Camry the trip takes 7.5 hrs, this trip took 11.5. I don't mind the extra time and the non-highway route is much more pleasant than I-75, but I want to be sure I'm not burning up my engine. Outside air temp didn't seem to have an impact on engine temp, it seemed to be all about the speed. The bus is tuned properly and it ran (walked?) well. I know 410 isn't ideal but is it satisfactory? Any thoughts or suggestions? JM
Back to top
View user's profile Send private message
Greg



Joined: 12 Aug 2009
Posts: 490
Location: Jefferson, GA

1969 Volkswagen Beetle

PostPosted: Sun Jun 16, 2013 7:28 pm    Post subject: Reply with quote

hmm, if the bus wouldn't do 55-60 without hitting 410+ then something isn't right. Others would know more but I wonder if you need to go up a main jet size...maybe too lean? Is there some place you could put it on an exhaust gas anyalyzer (if you find one, let me know, lol) I'm still fighting high CHTs as well. Mine usually happen on hills and at speeds above 60.

***don't take anything said here as truth, I'm still trying to figure it all out as well***
_________________
1969 Beetle
1974 Westy FI Conversion
Back to top
View user's profile Send private message Yahoo Messenger
mackay



Joined: 19 Oct 2011
Posts: 73
Location: North High Shoals, GA


PostPosted: Tue Jun 18, 2013 1:01 pm    Post subject: Reply with quote

Thank you, Greg, I'll try to find us an analyzer. JM
Back to top
View user's profile Send private message
mackay



Joined: 19 Oct 2011
Posts: 73
Location: North High Shoals, GA


PostPosted: Sun Jul 14, 2013 4:17 pm    Post subject: Reply with quote

I took Greg's advice and increased the jet size just a bit. I drove to Nashville this week and ran mostly between 360 and 390 degrees, doing mid to hi 50s and occasionally over 60 mph. While the outside temp was cooler than for my FL trip, this was a much harder trip on the bus (mountains.) I still hit 410 degrees and had to back off many times, mostly uphill, but not nearly as often as I did going to FL.

Apparently busses are rare up there because people came spilling out of shops and gas stations to tour the bus and tell me their VW stories. And the women! On this trip the bus was quite the babe magnet. Well, to be accurate, a babes-in-their-70s magnet. JM
Back to top
View user's profile Send private message
Greg



Joined: 12 Aug 2009
Posts: 490
Location: Jefferson, GA

1969 Volkswagen Beetle

PostPosted: Thu Jul 18, 2013 11:39 am    Post subject: Reply with quote

Not sure if I've asked this but have you checked your timing. It should be at 28 degrees BTDC with the hoses diconnected and plugged. Then hook the hoses back up and take it for a spin.
_________________
1969 Beetle
1974 Westy FI Conversion
Back to top
View user's profile Send private message Yahoo Messenger
Greg



Joined: 12 Aug 2009
Posts: 490
Location: Jefferson, GA

1969 Volkswagen Beetle

PostPosted: Thu Oct 10, 2013 4:44 pm    Post subject: Reply with quote

a little off topic but....here is what I did to help my CHT issue in the bus (retro fitted with a 77-78 FI system)

Turns out I had the wrong distributor for the FI system so I traced the model year down for the FI I had and found the right distributor for it. Apparently the old unit was advancing too far when I got on the throttle thus heating up the heads. That's right I said thus. Anyway, this new unit helped a lot with the CHTs. If anyone is still reading, the full story from the samba is below Smile


I found a 022-905-205S distributor in the classified and had it rebuilt by the philbin group. They did a great job and a pretty fast turn around. The distributor came back looking like a new unit with all the bits replaced or renewed. I almost didn't want to install it, it looked so nice Smile

Installed it in the bus, timed it to 28 degrees with the vacuum tube unplugged, then took it for a spin, (after plugging in the vacuum line). I had a little bit less power but the CHTs were MUCH lower. Hovering around 350-360 rather then the 390-400 range I was seeing. I may add a few more degrees of timing after the distributor gets "settled" but so far I'm pleased.
_________________
1969 Beetle
1974 Westy FI Conversion
Back to top
View user's profile Send private message Yahoo Messenger
Clyde



Joined: 03 Jun 2006
Posts: 855
Location: Athens


PostPosted: Thu Oct 10, 2013 8:34 pm    Post subject: Reply with quote

Quote:
had it rebuilt by the philbin group

My Mom always loved Regis.
_________________
'69 Bug, 1776, dual kadrons, Web 111 cam

Clyde's Aircooled
(706) 206 6327
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Greg



Joined: 12 Aug 2009
Posts: 490
Location: Jefferson, GA

1969 Volkswagen Beetle

PostPosted: Thu Oct 10, 2013 8:45 pm    Post subject: Reply with quote

Clyde wrote:
My Mom always loved Regis.


That's some funny stuff there! Laughing
_________________
1969 Beetle
1974 Westy FI Conversion
Back to top
View user's profile Send private message Yahoo Messenger
Mountain Power House



Joined: 26 Jul 2006
Posts: 879
Location: Aircooled Heaven USA


PostPosted: Fri Oct 11, 2013 12:39 am    Post subject: Reply with quote

Yes, you have issues. Ignition advance and enrichment are both a probability, along with the possibility for intake leaks and underlying mechanical issues.

There no excuse for a bus engine to run 410F in the ambient temps we've had as of late. Find the problem, else it will find you.
_________________
Jake Raby
57 Oval
64 Porsche 356C Outlaw
66 Bug -The Plague Returns!
73 VW Thing (Will I ever finish it?)
73 Superbeetle (Suby Power!)
76 Porsche 912E (X3!)
79 VW Iltis 4X4
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    AthensVWClub.com Forum Index -> Tech Talk All times are GMT - 4 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



AthensVWClub.com