We are currently running on the new domain and server: www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

52 dodge inline six

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Geoff2
Guru
Guru
Posts: 1301
Joined: Mon Nov 09, 2015 4:36 pm
Location: Australia

Re: 52 dodge inline six

Post by Geoff2 » Mon Jul 27, 2020 5:24 am

Why mess around trying to hop up a flat head that will never make much hp? Get a slant six if you want to stay with an inline engine.

benno318
Pro
Pro
Posts: 213
Joined: Sat Apr 03, 2010 7:55 am
Location: gold coast, AUSTRALIA

Re: 52 dodge inline six

Post by benno318 » Mon Jul 27, 2020 7:35 am

i built one for a guy with an old desoto, about a 48?? think it was around 218 ci or so... torquey old thing.
poor fella didnt know much about cars but saw this thing, fell in love with it, bought it and then learned about how much money it costs to build cars when you cant do any of it yourself.

the engine was fine until the bloke doing bodywork left it outside and uncovered with the front clip off it - water got into it and rusted a couple of the bores.

anyway he was talking about a few performance mods so i had a cam ground up, shaved the head to up the compression, ported the thing along with a rebore to get rid of the rust in the bores. whoever dismantled it did a great job of mixing up conrod caps and misplacing bolts etc.

we got it done, i did the first fire up for him and ran the cam in, eventually it wept a little from the rubber rear main seal (gasket set looked ancient so i wondered if the seal had shrunk/hardened) he thought i had fitted it poorly - it was a bolt on thing as i recall so pretty hard to get wrong - anyway he
sourced another and fitted it himself which made it ten times worse somehow. him and a mate replaced the worn carter 1 barrel with a 350 holley. not sure why they didnt find another 1 bbl.

he comes around one day and asks me to go for a drive with him, says it doesnt accelerate very well up hills. offers me the drive, i always decline as i like to see how they drive first. so off we go and near my old shop was a few really, really steep hills, like they type that are second gear in most 5 speed vehicles, and first gear in some! he gets it into top gear and its doing maybe 15-20mph and floors it, the poor old tank struggled up every hill at about 800rpm - old mate is used to his mercedes benz automatics and probably hasnt driven a manual in decades apart from this! i was surprised how well it did considering the lack of consideration by the driver. told him he was expecting too much of it and to drop it back a cog. sheeesh...

PackardV8
Guru
Guru
Posts: 6188
Joined: Sun Jul 30, 2006 2:03 pm
Location:

Re: 52 dodge inline six

Post by PackardV8 » Mon Jul 27, 2020 11:08 am

We've got one in the shop just now. About as simple as an engine can be. Egge and Kanter still have most parts for them.
Jack Vines
Studebaker-Packard V8 Limited
Obsolete Engineering

dynoflo
New Member
New Member
Posts: 36
Joined: Sun Apr 26, 2020 12:17 pm
Location: pa

Re: 52 dodge inline six

Post by dynoflo » Mon Jul 27, 2020 12:14 pm

i did one 2 years ago. here is a web site that is fairly informative. p13-d24.com. if your going to rebuild it have head and block pressure tested. the one i did had a sleeve leak after being in hot tank 2 times to clean rust out. the guy i did it for was happy with it and drives it almost every day to work. the rear main has bolt in upper and lower seals which are prone to leak. his does but he knows about the problem and just deals with it. he wanted a pentronix diistributor module which will not work with his automatic tranny wiring. it will be fine with standard shift. good luck.

pdq67
Guru
Guru
Posts: 9572
Joined: Thu Mar 04, 2010 8:05 pm
Location:

Re: 52 dodge inline six

Post by pdq67 » Mon Jul 27, 2020 12:48 pm

benno318 wrote:
Mon Jul 27, 2020 7:35 am
i built one for a guy with an old desoto, about a 48?? think it was around 218 ci or so... torquey old thing.
poor fella didnt know much about cars but saw this thing, fell in love with it, bought it and then learned about how much money it costs to build cars when you cant do any of it yourself.

the engine was fine until the bloke doing bodywork left it outside and uncovered with the front clip off it - water got into it and rusted a couple of the bores.

anyway he was talking about a few performance mods so i had a cam ground up, shaved the head to up the compression, ported the thing along with a rebore to get rid of the rust in the bores. whoever dismantled it did a great job of mixing up conrod caps and misplacing bolts etc.

we got it done, i did the first fire up for him and ran the cam in, eventually it wept a little from the rubber rear main seal (gasket set looked ancient so i wondered if the seal had shrunk/hardened) he thought i had fitted it poorly - it was a bolt on thing as i recall so pretty hard to get wrong - anyway he
sourced another and fitted it himself which made it ten times worse somehow. him and a mate replaced the worn carter 1 barrel with a 350 holley. not sure why they didnt find another 1 bbl.

he comes around one day and asks me to go for a drive with him, says it doesnt accelerate very well up hills. offers me the drive, i always decline as i like to see how they drive first. so off we go and near my old shop was a few really, really steep hills, like they type that are second gear in most 5 speed vehicles, and first gear in some! he gets it into top gear and its doing maybe 15-20mph and floors it, the poor old tank struggled up every hill at about 800rpm - old mate is used to his mercedes benz automatics and probably hasnt driven a manual in decades apart from this! i was surprised how well it did considering the lack of consideration by the driver. told him he was expecting too much of it and to drop it back a cog. sheeesh...
FWIW, my old '48 Dodge coupe had a split hood on it that opened from the sides.

It would rain and water would get on it's flathead and cause wet start problems all the time.

I kept a can of starting ether just for this..

pdq67

enigma57
Guru
Guru
Posts: 1887
Joined: Sun Oct 07, 2007 11:59 pm
Location: Galt's Gulch

Re: 52 dodge inline six

Post by enigma57 » Wed Jul 29, 2020 5:06 am

Tom Langdon has speed parts for the MOPAR flatheads (both the 23" and 25" blocks)......

http://www.langdonsstovebolt.com/

http://www.langdonsstovebolt.com/store/ ... ort=normal

http://www.langdonsstovebolt.com/store/ ... ort=normal

Hope this helps,

Harry

engineguyBill
Guru
Guru
Posts: 1198
Joined: Fri Feb 26, 2010 11:15 am
Location: Gold Canyon, AZ

Re: 52 dodge inline six

Post by engineguyBill » Wed Jul 29, 2020 2:28 pm

I think this flat head Chrysler six cylinder is the same as used in airport support vehicles such as baggage haulers, push-out tractors, etc., etc. There are literally millions of these engines still in use at airports all over the world.
As far as performance is concerned, the slant six engines are good base engines. Offenhauser offers a four barrel intake manifold; pistons and camshaft/valve train parts are readily available.
Bill

Perfect Circle Doctor of Motors certification
SAE Member (29+ years)
ASE Master Certified Engine Machinist (+ two otherASE Master Certifications)
AERA Certified Professional Engine Machinist

Post Reply