Lotus Elan

Pulling Head on Twin cam

PostPost by: tvacc » Sun Nov 14, 2004 4:18 pm

Hello all.



We are pulling the head on my Elan Twin Cam..the car that we drove from
Seattle to Kansas City.when the water pump gave out.



We are replacing the water pump..this time without pulling the engine as we
are just out of room to put the hoist.





Anyways.



After pulling the head..I noticed a great deal of carbon buildup on the
pistons.and on the chambers.



Should I clean this..both on the head and on the pistons.. Car was running
great.



Could this be because I was using Octane boost on the way cross country?



If I am to remove this carbon build up..what is the best way.?



I have not pulled a head on these in about 10 years.



Tony V

www.lotusowners.com
Tony Vaccaro
http://www.lotusowners.com
LOONY (Lotus Owners of New York)
Drive Fast Take Chances
71 Spyder Elan, ElanGTS, 93 Caterham, 05 Elise,
99 Elise190, 91 M100 Elan, 74 Europa, 72 Europa JPS #15, 68 Elan Coupe RHD
User avatar
tvacc
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1173
Joined: 24 Dec 2003
Location: Buffalo NY

PostPost by: elansprint71 » Sun Nov 14, 2004 4:31 pm

Tony- does a new engine come supplied with a carbon coating? No, remove it!
For a solution, check the archives for "Redex", we had a discussion on thisa while back (maybe 2 months ago) but I'm not sure if we found out if it is available on your side of the water; there must be something similar though.

Cheers,

Pete
----- Original Message -----
From: Tony Vaccaro
To: ***@***.*** ; ***@***.***
Sent: Sunday, November 14, 2004 4:23 PM
Subject: [LotusElan.net] Pulling Head on Twin cam


Hello all.



We are pulling the head on my Elan Twin Cam..the car that we drove from
Seattle to Kansas City.when the water pump gave out.



We are replacing the water pump..this time without pulling the engine as we
are just out of room to put the hoist.





Anyways.



After pulling the head..I noticed a great deal of carbon buildup on the
pistons.and on the chambers.



Should I clean this..both on the head and on the pistons.. Car was running
great.



Could this be because I was using Octane boost on the way cross country?



If I am to remove this carbon build up..what is the best way.?



I have not pulled a head on these in about 10 years.



Tony V

www.lotusowners.com










To search the mailing list archives:
http://www.escribe.com/automotive/europ ... index.html
elansprint71
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 4092
Joined: 16 Sep 2003
Location: Cheshire, UK.

PostPost by: triumphelan » Sun Nov 14, 2004 4:33 pm

Tony
I have just had my twink out to replace the clutch ,whilst it was out I didthe usual bits waterpump new gaskets etc .The engine was out about 5yrs ago for waterpump ,I needed to decoke the head and pistons both times ,I used a rotary wire brush.The carbon was soft ,I think it is due to the Webers putting in excess petrol which is not burnt properly
Regards John 1969S4 DHC
----- Original Message -----
From: Tony Vaccaro
To: ***@***.*** ; ***@***.***
Sent: Sunday, November 14, 2004 4:23 PM
Subject: [LotusElan.net] Pulling Head on Twin cam


Hello all.



We are pulling the head on my Elan Twin Cam..the car that we drove from
Seattle to Kansas City.when the water pump gave out.



We are replacing the water pump..this time without pulling the engine as we
are just out of room to put the hoist.





Anyways.



After pulling the head..I noticed a great deal of carbon buildup on the
pistons.and on the chambers.



Should I clean this..both on the head and on the pistons.. Car was running
great.



Could this be because I was using Octane boost on the way cross country?



If I am to remove this carbon build up..what is the best way.?



I have not pulled a head on these in about 10 years.



Tony V

www.lotusowners.com










To search the mailing list archives:
http://www.escribe.com/automotive/europ ... index.html
Regards John 1969S4DHC
triumphelan
Third Gear
Third Gear
 
Posts: 297
Joined: 04 Jul 2005
Location: UK North London HA61PY

PostPost by: twincamracing » Sun Nov 14, 2004 4:53 pm

Should I clean this..both on the head and on the pistons.. Car was
running great.

I would

Could this be because I was using Octane boost on the way cross
country?

probably not but I've seen some octane boosters leave odd coloured
deposits...looking more like iron oxide than carbon.

If I am to remove this carbon build up..what is the best way.?

someone suggested a rotary brush but be cautious of overly stiff
bristles gouging the soft alloy. if the carbon is soft a handheld brass
or stainless brush and a bit of solvent will do nicely, for stubborn
bits try an old feeler guage.

I have not pulled a head on these in about 10 years.

Time to refresh yourself ;) As long as the head is off you could check
the valve seating surface, guide condition etc, then hand lap all the
valves.

Cheers,
Scott




__________________________________
Do you Yahoo!?
Check out the new Yahoo! Front Page.
www.yahoo.com
twincamracing
Second Gear
Second Gear
 
Posts: 85
Joined: 16 Sep 2004

PostPost by: davidallen » Mon Nov 15, 2004 10:17 am

There was a great suggestion a few weeks ago about this.

To stop carbon falling between the piston and rings, drop the piston down by
1/2" and add a layer of grease into the corner. When all the carbon has been
removed move the pistons further down the bore and wipe away the grease!

David

-----Original Message-----
From: scott potter [mailto:***@***.***
Sent: 14 November 2004 16:53
To: ***@***.***
Subject: Re: [LotusElan.net] Pulling Head on Twin cam



Should I clean this..both on the head and on the pistons.. Car was
running great.

I would

Could this be because I was using Octane boost on the way cross
country?

probably not but I've seen some octane boosters leave odd coloured
deposits...looking more like iron oxide than carbon.

If I am to remove this carbon build up..what is the best way.?

someone suggested a rotary brush but be cautious of overly stiff
bristles gouging the soft alloy. if the carbon is soft a handheld brass
or stainless brush and a bit of solvent will do nicely, for stubborn
bits try an old feeler guage.

I have not pulled a head on these in about 10 years.

Time to refresh yourself ;) As long as the head is off you could check
the valve seating surface, guide condition etc, then hand lap all the
valves.

Cheers,
Scott




__________________________________
Do you Yahoo!?
Check out the new Yahoo! Front Page.
www.yahoo.com








To search the mailing list archives:
http://www.escribe.com/automotive/europ ... index.html



Yahoo! Groups Links
davidallen
Third Gear
Third Gear
 
Posts: 293
Joined: 11 Aug 2005

PostPost by: ddddumas » Tue Nov 16, 2004 6:46 pm

--- In ***@***.***, "Tony Vaccaro" <[email protected]> wrote:
...After pulling the head..I noticed a great deal of carbon buildup
on the pistons.and on the chambers. Should I clean this..both on the
head and on the pistons.. Car was running great...If I am to remove
this carbon build up..what is the best way.?
--------------
Tony,
I think a drill driven rotary wire brush would be fine as long as you
use a "very light hand" to avoid eating up the aluminum combustion
chamber.

I've never run it in my twincam, but my modern V6 daily drivers get a
bottle of Techron concentrate, a Chevron additive, in the gas tank
every 3,000 miles to clean/keep the carbon out of the combustion
chambers. At full strength, this concentrate might be just the
ticket for a copper scouring pad hand-scrub clean-up of the
combustion chambers. Usual disclaimers - no links to Chevron, et al.

Best regards,
Paul Garrett
----------------
ddddumas
Second Gear
Second Gear
 
Posts: 72
Joined: 25 Sep 2003

Total Online:

Users browsing this forum: No registered users and 14 guests