Lotus Elan

Oil and black deposits inside rear carb

PostPost by: pharriso » Sat Jan 06, 2018 4:13 pm

tbsmith wrote:Thanks Phil. Does the replacement solenoid have the manual button on it? Comes in handing during compression checks, etc?
Tom


The original did.

tbsmith wrote:Follow up question on the black stuff in the manifold:
Does this look normal? There was also a layer on the engine side of the throttle plate. Kind of gooey and easy to remove with rag or scraper. If not normal, what could cause it? The engine runs fine. The small holes in the top of the manifold are where the (balance?) tube connects the two manifolds.

Tom


Pretty sure that it is normal fumes from the head breather tube. I guess the Stromberg head has an advantage that 3 & 4 take in the crud, wheras with a Weber head it's #4 only. :lol:
Phil Harrison
1972 Elan Sprint 0260K
User avatar
pharriso
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2803
Joined: 15 Sep 2010
Location: Long Island NY, USA

PostPost by: saildrive2001 » Sat Jan 06, 2018 5:23 pm

I have never seen anything like that in my engine.
Keith Marshall
69 S4 SE DHC RHD Original owner
saildrive2001
Third Gear
Third Gear
 
Posts: 499
Joined: 29 Oct 2003
Location: Ontario, Canada

PostPost by: tbsmith » Sat Jan 06, 2018 5:33 pm

The first picture is the manifold to cylinders 1 and 2. The second is to cylinders 3 and 4 so whatever is going on, it is in all 4 cylinders. The fact that it is downstream of the throttle plate leads me to believe it isn't from the breather tube.
User avatar
tbsmith
Second Gear
Second Gear
 
Posts: 80
Joined: 21 Jun 2007
Location: Texas

PostPost by: RogerFrench » Sat Jan 06, 2018 10:17 pm

Tom, your car has a non-Federal high-level balance pipe intake, as fitted in UK and other countries to Stromberg-carbed engines, like the S4 Elan. It has a couple of non-standard hose clips, whose purpose I guess is to provide some kind of mount for the throttle cable outer, which normally attached to a fitting on the cambox cover. That fitting doesn't exist on Big Valve camboxes.
As for the gooey crud, may I ask if your engine smokes a lot? There's often deposits in intakes, but not as much as you show and I'm wondering about the state of your valve guides.
Are there any pipes attached to your intake, like for vacuum headlamp operation or brake boosters? They might be sources of "stuff".
1967 Elan S3
1972 Europa Twin Cam
2005 Elise
User avatar
RogerFrench
Fourth Gear
Fourth Gear
 
Posts: 619
Joined: 01 Dec 2009
Location: Richmond, TX

PostPost by: tbsmith » Sun Jan 07, 2018 4:17 pm

Hi Roger, thanks for the info. Yes the extra hose clamps were added by the PO to mount the throttle cable. I've never noticed any smoke from the exhaust, but I will make a point to check. If I remember correctly worn valve guides would show smoke especially on deceleration. There are no connections to the manifold as I converted to electric headlamp motors a while back and I don't have a brake booster.

Regards,
Tom
User avatar
tbsmith
Second Gear
Second Gear
 
Posts: 80
Joined: 21 Jun 2007
Location: Texas
Previous

Total Online:

Users browsing this forum: No registered users and 4 guests