Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 10-28-2019, 06:50 PM   #1
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,507
Default Carbon build up inside intake bores?

I took the 4 barrel intake off my 8BA to change to Tri-Power intake. Motor has less than 3000 Miles. Inspected intake valves & springs which looked fine. I was surprised to see carbon build up in the intake bores that line up with the intake manifold between where they mate & the valve stems? No combustion S/B happening to create carbon in those bores? Maybe valves leaking igniting gas vapor in passage ways? Assuming needs disassembly to clean carbon to keep carbon pieces out of cylinders? Whatís going on?
__________________
Nomad
AnthonyG is online now   Reply With Quote
Old 10-29-2019, 10:28 AM   #2
19Fordy
Senior Member
 
19Fordy's Avatar
 
Join Date: May 2010
Location: Coral Springs FL
Posts: 7,202
Default Re: Carbon build up inside intake bores?

Could running rich cause that?
19Fordy is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 10-29-2019, 01:04 PM   #3
flatheadmurre
Senior Member
 
flatheadmurre's Avatar
 
Join Date: Apr 2015
Location: Sweden
Posts: 2,488
Default Re: Carbon build up inside intake bores?

Depending on how hard you drive it...valves floating give you issues like that...
Burnt valves or a hole between heatriser and intake would make the car run bad...
Does it run as it should ?
flatheadmurre is offline   Reply With Quote
Old 10-29-2019, 01:44 PM   #4
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,507
Default Re: Carbon build up inside intake bores?

Always ran well, smelled a little rich but thought that was the nature of the beast. Never pushed it real hard. 3500rpm-4000rpm shifts occasionally. Engine has fewer than 2500miís
__________________
Nomad
AnthonyG is online now   Reply With Quote
Old 10-29-2019, 02:33 PM   #5
Lawrie
Senior Member
 
Lawrie's Avatar
 
Join Date: May 2010
Location: Qld, Australia
Posts: 3,284
Default Re: Carbon build up inside intake bores?

From experience,its sucking oil up or around the guides
Lawrie
Lawrie is offline   Reply With Quote
Old 10-29-2019, 03:33 PM   #6
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,507
Default Re: Carbon build up inside intake bores?

Laurie, is there a cure or is it the nature of the beast? W only 2000 + miles since build it’s obviously been happening since first start I’d think?
__________________
Nomad
AnthonyG is online now   Reply With Quote
Old 10-29-2019, 03:34 PM   #7
JWL
Senior Member
 
Join Date: May 2010
Location: Fitzgerald, Georgia
Posts: 1,950
Default Re: Carbon build up inside intake bores?

One of the big culprits causing the problem Lawrie mentioned is using the engine "coast down" as a method of braking. The crankcase pressure can push oil up the guides/valves and into the port. Most of my experience has shown the accumulation of carbon on the valves, rather than the ports.

There is also something to be said for valve timing, but that is a big subject and might not be associated to your problem..
JWL is offline   Reply With Quote
Old 10-29-2019, 03:40 PM   #8
Init1
Senior Member
 
Init1's Avatar
 
Join Date: May 2010
Location: Oregon City, Oregon
Posts: 207
Default Re: Carbon build up inside intake bores?

I agree with the other guys. Worn guides and way to rich.
It should have stunk when it was running too.
Init1 is offline   Reply With Quote
Old 10-29-2019, 03:54 PM   #9
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,507
Default Re: Carbon build up inside intake bores?

In hindsight yes it smelled rich, but the older cars all smell rich compared to the modern computer controlled fuel injection. I have a ‘67 442 runs perfect but smells a lot more than my ‘07 BMW. Guess I thought it relative as old to new engine science. Beside a few typical issues the 8BA always ran, idled & accelerated great! I do admit to what JWL mentions & do use the engine & Tranny compression braking to slow down especially w mechanical brakes.
__________________
Nomad
AnthonyG is online now   Reply With Quote
Old 10-29-2019, 04:22 PM   #10
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,507
Default Re: Carbon build up inside intake bores?

Question is: Do I just surface clean the intake ports lightly removing loose carbon w wd40 or spin a wire wheel on drill to clean all? If I do are precautions like shop vac running on each at same time enough? Or is it break engine down clean polish ports then clean block & reassemble engine time?
__________________
Nomad
AnthonyG is online now   Reply With Quote
Old 10-29-2019, 04:43 PM   #11
scicala
Senior Member
 
scicala's Avatar
 
Join Date: Jun 2010
Location: Detroit suburb, MI
Posts: 2,608
Default Re: Carbon build up inside intake bores?

Did you change camshafts recently ? If it has a cam with a lot of overlap (intake and exhaust valves opened at the same time), then it's possible to have reversion in the intake which is backwards pulses from the exhaust. I had the inside of an intake manifold turn black because of this.


Sal
scicala is offline   Reply With Quote
Old 10-29-2019, 05:37 PM   #12
40cpe
Senior Member
 
40cpe's Avatar
 
Join Date: May 2010
Location: Star, MS
Posts: 3,384
Default Re: Carbon build up inside intake bores?

For personal interests, would MMO or Sea Foam help keep such deposits from forming?
40cpe is online now   Reply With Quote
Old 10-29-2019, 05:52 PM   #13
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,507
Default Re: Carbon build up inside intake bores?

I haven’t. U could b right on the valve timing? I’ve heard same w modern perfed engines. I have several classics & work on them but never had One w adjustable solids so no experience there. I stumbled into the Flatty thing when my 90 yr old Mom’s 80 yr old widowed girl friend had a car she wanted me to look at & let her know what I thought she’d get for it. Thought I’d be checking out a Pontiac Parisian or something. Turns out to b a 60k mile ‘35 Tudor in her heated garage for 30 yrs perfect condition since her husband died. Missing engine ( another story for another time). I could of got it for $2k but as was Mom’s friend gave $6500. So found a Flatty builder ( Jerry Livingston owner of United Engine Specialists) & had an 8BA perf’d up a bit built 5 yrs ago. He put a 3/4 isky cam & adjustable lifters. Got under 2500 miles on it. So, probly should put 4 barrel intake on it get rid of it & put a Sb Chevy (more my territory) in it. Probly gut reaction cause not a happy camper right now!
__________________
Nomad
AnthonyG is online now   Reply With Quote
Old 10-29-2019, 06:21 PM   #14
fortyfords
Senior Member
 
fortyfords's Avatar
 
Join Date: Mar 2011
Location: faucett, mo
Posts: 303
Default Re: Carbon build up inside intake bores?

I'm not real smart but if the exhaust stinks, I would think the engine is running to cool if the plugs look good.
fortyfords is offline   Reply With Quote
Old 10-29-2019, 06:46 PM   #15
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,507
Default Re: Carbon build up inside intake bores?

Kind of weird. When I saw carbon buildup in the ports I pulled a head to see if carbon extended to valves. Saw some but minimal so thinking Lawrie had it right. But also pulled plugs on same side & 2 were a nice light toast color & two were black��? I have a temp gauge on each bank and one coming off radiator push side in the dash. Runs at 180-200 pretty consistent.
__________________
Nomad
AnthonyG is online now   Reply With Quote
Old 10-29-2019, 07:00 PM   #16
richard crow
Senior Member
 
Join Date: May 2010
Posts: 1,374
Default Re: Carbon build up inside intake bores?

if you want to get rid of the carbon get a coffe cup fill with water. bring eng rpm up to about 1500 rpm pour the water down the carb slowe you don,t want to stall the eng do that when ever you think the eng needs it
richard crow is offline   Reply With Quote
Old 10-30-2019, 01:54 AM   #17
A bones
Senior Member
 
A bones's Avatar
 
Join Date: May 2010
Location: CLAYTON DE
Posts: 891
Default Re: Carbon build up inside intake bores?

Better than a cup would be a restricted flow, ketchup squirter or any squeeze bottle. This to control volume of flow. Higher RPM would also be better.

Never want to add too much, at a time.
I once killed a good motor. Boo Hoo.

I did however perform many 'miracles' In the day.
__________________
Enjoy yer day. Tom
Hate can't fix what it started.
A bones is online now   Reply With Quote
Old 10-30-2019, 02:30 AM   #18
Lawrie
Senior Member
 
Lawrie's Avatar
 
Join Date: May 2010
Location: Qld, Australia
Posts: 3,284
Default Re: Carbon build up inside intake bores?

Over a few years in my 33 babbit engine, I had this problem.
My fault first up, using old guides and valves.
next try better valves . still same problem,
3 rd try (slow learner) good valves and guides,better.but still would oil up and on a LONG down hill blow smoke at bottom.
Fitted new straight valves and guides with bronze liners in the guides and seals on the inlet valves,
No problem from then on.
The current engine in the 33 (99a),first I still tried the old mushroom valves and split guides for a while but it would oil a plug or two on trips,
did the same as the old engine with new straight valves and guides with the seals on the inlets and bronze liners, that engine has done about 70000 klms ,uses no oil runs great.
Lawrie
Lawrie is offline   Reply With Quote
Old 10-30-2019, 04:39 AM   #19
BUBBAS IGNITION
Senior Member
 
BUBBAS IGNITION's Avatar
 
Join Date: May 2010
Location: SPEEDWAY INDIANA
Posts: 3,829
Default Re: Carbon build up inside intake bores?

And Lawrie said :

straight valves and guides with the seals on the inlets and bronze liners, that engine has done about 70000 klms ,uses no oil runs great.

The answer i believe ......
__________________
If it Makes Spark, we do it !!!!
www.bubbasignition.com
jimlinder@juno.com
BUBBAS IGNITION is offline   Reply With Quote
Old 10-30-2019, 05:55 AM   #20
GOSFAST
Senior Member
 
GOSFAST's Avatar
 
Join Date: May 2010
Location: Long Island, NY
Posts: 932
Default Re: Carbon build up inside intake bores?

We began addressing this very issue with my own F-1 back in the late '70's, got totally fed up with "hanging" valves in the 239" during long periods of storage. Needed to come up with a sure fire fix!

Took all 16 guides out and lined them with the K-line bronze liners! Machined all 16 guides for some "Perfect-Circle" rubber/teflon valve stem seals, today we do the 8 intakes only unless customer wants all 16 done. We've learned over time the exhaust's weren't necessary.

Since we began this procedure we've probably used/sold a couple thousand or so! The bronze liners in conjunction with some stainless valves was one of the best moves we ever made on the Flatheads!

A very close friend of mine back here on Long Island built nothing but Flatheads, we worked closely with him on all the machining, he would bring us about 10/15 a year back then? Every single one of his builds got the S/S valve/bronze liner pkge!

Thanks, Gary in N.Y.

P.S. Here's a couple shots (again) on the package, valves, lined guides, and today's Viton stem seals! We stopped using the rubber/teflon a few years back now! The Vitons are easier to install, no "sleeves" involved!
Attached Images
File Type: jpg Flathead Bronze Guides Seals.JPG (74.5 KB, 67 views)
File Type: jpg Flathead Bronze Guides-Seals-Valves.JPG (76.0 KB, 61 views)
File Type: jpg Flathead Valve Train Pkge A.JPG (68.8 KB, 57 views)
GOSFAST is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 07:27 PM.