 Newbie Tears Into Webers |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| r_towle |
 Oct 12 2009, 11:37 AM
Post
#81
|
|
Custom Member  Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
 |
QUOTE(kenshapiro2002 @ Oct 12 2009, 01:00 PM)  My float was at 8mm (with gasket on), instead of the 10mm it should have been. What significant behaviors, if any, might that have been causing? Everything else looked pretty clean in this first carb, and it's going back together very nicely...no where near as confusing as I thought it would be...definitely a 3-4 on a scale of 1-10. I;m guessing that if carbs were a problem with my performance, it was more the adjustment itself, but we'll see. 8mm versus 10mm means you could have been flooding the motor with the float not seating the valve correctly. If you changed the valve and seat to the new one, that may account for the 2mm difference. Rarely do both carbs match...that, as you can imagine, does affect how the motor runs. The drop measurement is also critical due to the fact that its when the valve opens, and due to the geometry of the float, if it opens to far...it can get stuck. Rich |
   |
 
|
| kenshapiro2002 |
Oct 12 2009, 12:46 PM
Post
#82
|
|
Senior Member Group: Members Posts: 1,486 Joined: 23-July 09 From: Bawlmer, MD Member No.: 10,598 Region Association: MidAtlantic Region |
Now...if it runs as well as it looks...
 Any logic in putting the rebuilt carb back in with the one yet to be done, just to see if things improve or not? |
|
|
|
| SirAndy |
Oct 12 2009, 12:50 PM
Post
#83
|
|
Resident German Group: Admin Posts: 42,469 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(kenshapiro2002 @ Oct 12 2009, 10:46 AM) Any logic in putting the rebuilt carb back in with the one yet to be done, just to see if things improve or not? No. But once both are done and one side gives you trouble, a quick way to check if it's carb related or engine related is to swap the carbs side to side ... (IMG:style_emoticons/default/shades.gif) Andy |
 |
|
| kenshapiro2002 |
Oct 12 2009, 01:01 PM
Post
#84
|
|
Senior Member Group: Members Posts: 1,486 Joined: 23-July 09 From: Bawlmer, MD Member No.: 10,598 Region Association: MidAtlantic Region |
OK...thanks.
QUOTE(SirAndy @ Oct 12 2009, 02:50 PM) QUOTE(kenshapiro2002 @ Oct 12 2009, 10:46 AM) Any logic in putting the rebuilt carb back in with the one yet to be done, just to see if things improve or not? No. But once both are done and one side gives you trouble, a quick way to check if it's carb related or engine related is to swap the carbs side to side ... (IMG:style_emoticons/default/shades.gif) Andy |
|
|
|
| r_towle |
Oct 12 2009, 01:09 PM
Post
#85
|
|
Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
|
Just do the other one...then you will KNOW its done and wont question the float settings, or the gunk...
Rich |
|
|
|
| McMark |
Oct 12 2009, 01:31 PM
Post
#86
|
|
914 Freak! Group: Retired Admin Posts: 20,180 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I'm a little late to this thread, but my comments.
1. Floats checked in water need to be absolutely dry before you put them back in. Water drops will sit in your float bowls and corrode the aluminum, possibly creating 'crap' that will clog carbs. 2. You ABSOLUTELY need to sync the carbs before you can expect them to run correctly. I don't care how "perfectly" you took it apart. Assuming things like this are 'right' is where you'll chase your tail forever. Do it. Don't debate it. Do it. Do it. Do it. 3. No, there is no logic to putting bad, dirty parts back into your car just as a 'test'. Just clean them both out thoroughly, make sure everything is right on them, and then put them both back in. You're really 'shortcutting' here and it's only going to make it take longer. 4. You don't need to quote something in every reply. (This applies to Rich T as well. (IMG:style_emoticons/default/wink.gif) ) We're reading the thread. We can follow along. 5. You should write down, or post here all you jet/venturi sizes for reference. |
|
|
|
| kenshapiro2002 |
Oct 12 2009, 01:44 PM
Post
#87
|
|
Senior Member Group: Members Posts: 1,486 Joined: 23-July 09 From: Bawlmer, MD Member No.: 10,598 Region Association: MidAtlantic Region |
Idle - 50
Main - 115 AC Jet - 200 Emulsion Tubes - F11 Accel. Pump Value - 55 Accel. Pump Jets - 50 EW |
|
|
|
| r_towle |
Oct 12 2009, 03:04 PM
Post
#88
|
|
Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
|
QUOTE(McMark @ Oct 12 2009, 03:31 PM) I'm a little late to this thread, but my comments. 1. Floats checked in water need to be absolutely dry before you put them back in. Water drops will sit in your float bowls and corrode the aluminum, possibly creating 'crap' that will clog carbs. 2. You ABSOLUTELY need to sync the carbs before you can expect them to run correctly. I don't care how "perfectly" you took it apart. Assuming things like this are 'right' is where you'll chase your tail forever. Do it. Don't debate it. Do it. Do it. Do it. 3. No, there is no logic to putting bad, dirty parts back into your car just as a 'test'. Just clean them both out thoroughly, make sure everything is right on them, and then put them both back in. You're really 'shortcutting' here and it's only going to make it take longer. 4. You don't need to quote something in every reply. (This applies to Rich T as well. (IMG:style_emoticons/default/wink.gif) ) We're reading the thread. We can follow along. 5. You should write down, or post here all you jet/venturi sizes for reference. I dont quote everything... Rich |
|
|
|
| kenshapiro2002 |
Oct 12 2009, 04:34 PM
Post
#89
|
|
Senior Member Group: Members Posts: 1,486 Joined: 23-July 09 From: Bawlmer, MD Member No.: 10,598 Region Association: MidAtlantic Region |
Neither do I, but then again, he didn't say that we did. He said, "You don't need to quote something in every reply", meaning we do it too often for his likes. I am trying, therefore, to cut back. It must be a bad thing, and I wanna be good.Like when you told me not to post my questions to "both" sites. I stopped that when you spanked me, and now you've been spanked too. Hurts horribly doesn't it? (IMG:style_emoticons/default/hissyfit.gif)
I dont quote everything... Rich [/quote] |
|
|
|
| jmill |
Oct 12 2009, 05:17 PM
Post
#90
|
|
Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
I thought you went to 125 mains. Are you going back to the 115's now?
They'll also need to know your vent size. I'm assuming it's 28. |
|
|
|
| kenshapiro2002 |
Oct 12 2009, 07:16 PM
Post
#91
|
|
Senior Member Group: Members Posts: 1,486 Joined: 23-July 09 From: Bawlmer, MD Member No.: 10,598 Region Association: MidAtlantic Region |
I bought the 125s, ran them for a few days and then things went south again. I can use either. I figure the 115s were in there for the guy who built the car in 1984 and it ran well for him. It might be a performance improvement, but it didn't solve my problem with driveability. I'd like to get it running right without changing too much.
Whattaya mean by vent size? QUOTE(jmill @ Oct 12 2009, 07:17 PM) I thought you went to 125 mains. Are you going back to the 115's now? They'll also need to know your vent size. I'm assuming it's 28. |
|
|
|
| neil30076 |
Oct 12 2009, 07:33 PM
Post
#92
|
|
Recovering dismantler! Group: Members Posts: 397 Joined: 12-September 06 From: San Diego ( RB) CA Member No.: 6,826 Region Association: Southwest Region |
QUOTE(kenshapiro2002 @ Oct 12 2009, 06:16 PM) Whattaya mean by vent size? (IMG:style_emoticons/default/blink.gif) ( venturi) - I'll make this non technical - It's the cast aluminum tube sitting down inside each bore of the carb - if you remove the screw locking it in you can remove it, or the size may be visible if you look down in to it. Don't refer to the diagram Rich posted long ago, its not on there! |
|
|
|
| URY914 |
Oct 12 2009, 07:37 PM
Post
#93
|
|
I built the lightest 914 in the history of mankind. Group: Members Posts: 132,083 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
When reinstalling the carb to the manifold, and the manifold to the head you must use new gaskets. Also use gaskets between the air cleaner housing and the linkage base plate if you have one. You can not have metal to metal anywhere. It will leak air. All the air must enter the carb from the top, not leaking in from the sides. Air leaks will cause back firing and popping.
And when you tighten the carb to manifold nuts and the manifold to head studs use lock washers. The nuts need to be snug to prevent air leaks. |
|
|
|
| kenshapiro2002 |
Oct 12 2009, 09:02 PM
Post
#94
|
|
Senior Member Group: Members Posts: 1,486 Joined: 23-July 09 From: Bawlmer, MD Member No.: 10,598 Region Association: MidAtlantic Region |
Oh...the auxiliary venturis! They are 28s. Hey...why do they need to be removed when cleaning the carbs ?
QUOTE(neil30076 @ Oct 12 2009, 09:33 PM) QUOTE(kenshapiro2002 @ Oct 12 2009, 06:16 PM) Whattaya mean by vent size? (IMG:style_emoticons/default/blink.gif) ( venturi) - I'll make this non technical - It's the cast aluminum tube sitting down inside each bore of the carb - if you remove the screw locking it in you can remove it, or the size may be visible if you look down in to it. Don't refer to the diagram Rich posted long ago, its not on there! |
|
|
|
| kenshapiro2002 |
Oct 12 2009, 09:05 PM
Post
#95
|
|
Senior Member Group: Members Posts: 1,486 Joined: 23-July 09 From: Bawlmer, MD Member No.: 10,598 Region Association: MidAtlantic Region |
I had tons of popping and backfiring. I'm using all new gaskets eberywhere...no metal to metal. None of the manifold nuts had any washers on them and the manifold to head nuts were almost finger loose. I'll get some lock washers...thanks!
QUOTE(URY914 @ Oct 12 2009, 09:37 PM) When reinstalling the carb to the manifold, and the manifold to the head you must use new gaskets. Also use gaskets between the air cleaner housing and the linkage base plate if you have one. You can not have metal to metal anywhere. It will leak air. All the air must enter the carb from the top, not leaking in from the sides. Air leaks will cause back firing and popping. And when you tighten the carb to manifold nuts and the manifold to head studs use lock washers. The nuts need to be snug to prevent air leaks. |
|
|
|
| jmill |
Oct 12 2009, 09:12 PM
Post
#96
|
|
Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
Washers find a way to drop into the intake and cause havoc. I like nylocks.
|
|
|
|
| McMark |
Oct 12 2009, 09:34 PM
Post
#97
|
|
914 Freak! Group: Retired Admin Posts: 20,180 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
(IMG:style_emoticons/default/av-943.gif) You guys are funny. (IMG:style_emoticons/default/lol-2.gif)
|
|
|
|
| VaccaRabite |
Oct 12 2009, 10:51 PM
Post
#98
|
|
En Garde! Group: Admin Posts: 13,845 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region
|
QUOTE(kenshapiro2002 @ Oct 12 2009, 10:02 PM) Oh...the auxiliary venturis! They are 28s. Hey...why do they need to be removed when cleaning the carbs ? (Quoted for Burgerman) (IMG:style_emoticons/default/poke.gif) No. the 28s are your main venturi. Your aux vents are inside the main vents. In the pic below (a 40 IDF) #14is the aux, and #15 is the main. (IMG:http://www.carburetion.com/diags/diagimg/40idfpic.jpg) Zach |
|
|
|
| jaxdream |
Oct 13 2009, 12:30 AM
Post
#99
|
|
Senior Member Group: Members Posts: 974 Joined: 8-July 08 From: North Central Tennessee Member No.: 9,270 Region Association: South East States |
The fella is trying do solve some issues himself, I won't knock him for that . Not everybody was born with a wrench in hand, it takes time and most of all patience. He's no different than others here , he just wants to get his car running , rolling , stopping very well so he can enjoy the pleasure of driving and owning a 914.
Ken your persistance will pay off!! Keep it up. (IMG:style_emoticons/default/aktion035.gif) (IMG:style_emoticons/default/piratenanner.gif) Jaxdream |
|
|
|
| kenshapiro2002 |
Oct 13 2009, 05:29 AM
Post
#100
|
|
Senior Member Group: Members Posts: 1,486 Joined: 23-July 09 From: Bawlmer, MD Member No.: 10,598 Region Association: MidAtlantic Region |
See...if I just say "Thanks" (to your compliment about my funniness) withour quoting you, nobody will know what the hell I'm responding to. (IMG:style_emoticons/default/piratenanner.gif)
QUOTE(McMark @ Oct 12 2009, 11:34 PM) (IMG:style_emoticons/default/av-943.gif) You guys are funny. (IMG:style_emoticons/default/lol-2.gif) |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 2nd April 2026 - 06:47 PM |
Invision Power Board
v9.1.4 © 2026 IPS, Inc.