4 Wheel Parts
4WD
ALLDATAdiy
JC Whitney
Off-Road Tires
Dodge Parts


Author Topic: Hercules 4cyl diesel... who knows about it?  (Read 531 times)

0 Members and 1 Guest are viewing this topic.

Offline mttaff

  • You shoulda bought a DODGE!
  • Lifetime Supporter
  • Sr. Member
  • *
  • Posts: 2634
  • Gender: Male
Hercules 4cyl diesel... who knows about it?
« on: August 27, 2012, 06:16:26 AM »
There is a Hercules 4 cylinder diesel available here locally. Im curious if anybody knows much about them. My guess is that parts are hard to find. Im not a diesel guy but seems like a cool motor with 727. Seems like it would be underpowered for a truck but what about an rc? Just curious what you guys know.
78 crewcab, d60's,        6" lift and 35's                                76 ramcharger, d60's,   6" lift and 35's

Offline sls001

  • Full Member
  • ****
  • Posts: 1468
  • Gender: Male
  • One test is worth 1,000 expert opinions!
Re: Hercules 4cyl diesel... who knows about it?
« Reply #1 on: August 27, 2012, 06:29:06 AM »
I believe there are several different sizes.  Do you know which one it is?  Most I've seen where on generator's, marine applications, equipment, etc and very low HP.

Offline mttaff

  • You shoulda bought a DODGE!
  • Lifetime Supporter
  • Sr. Member
  • *
  • Posts: 2634
  • Gender: Male
Re: Hercules 4cyl diesel... who knows about it?
« Reply #2 on: August 27, 2012, 07:00:34 AM »
3.7 with 727 tranny
78 crewcab, d60's,        6" lift and 35's                                76 ramcharger, d60's,   6" lift and 35's

Offline 85 Royal SE Prospector

  • Sr. Member
  • *****
  • Posts: 4757
  • Gender: Male
Re: Hercules 4cyl diesel... who knows about it?
« Reply #3 on: August 29, 2012, 06:11:01 PM »
An RC is heavy. If it would be underpowered cruising for a truck, it would be for an RC too.
1985 Dodge Royal SE Prospector Ramcharger 318 4x4

BigDaddy99HD

  • Guest
Re: Hercules 4cyl diesel... who knows about it?
« Reply #4 on: September 2, 2012, 11:38:10 AM »
Could always fab a turbo onto it  ;D

Offline Tman

  • RCC Rookie
  • **
  • Posts: 484
  • Gender: Male
  • RamchargerCentral.Com Rules!
Re: Hercules 4cyl diesel... who knows about it?
« Reply #5 on: September 2, 2012, 04:02:41 PM »
I'm not familiar with that engine.  Is a 3.7 around 220 cubic inches?  How much horse power does it have?

It would probably pull an RC down the road, but it would probably be a SLOW ride!!!  I believe the international scouts had a small factory diesel available back in the 70's.  I know a guy who drove one about 25 years ago.  He said it was painfully  slow.  Having a vehicle that was slow by 1980's standards would be even worse today!

Now that little diesel may make sense to swap it into a smaller vehicle.  It would need to be light weight though.  Of course, it it is strong enough to take some boost.....you could install it in a heavier vehicle.
1985 Dodge D-150 pick-up.  360, 727, 8 1/4 axle.  Royal, Prospector, & SE packages.   Looks stock
1993 Jeep Cherokee  4.0, automatic, 4x4
2002 Intrepid

Offline Captain Obvious

  • Sr. Member
  • *****
  • Posts: 3553
  • Gender: Male
    • How to find truck help fast
Re: Hercules 4cyl diesel... who knows about it?
« Reply #6 on: September 2, 2012, 04:50:30 PM »
If it has a turbo it could be worth it. Similar power to a 318 or cummins 4.

If it doesnt have a turbo, probably not worth it. Turbo is only a benefit if it can blow dirty smoke at wot. Smoke is the rich lean indicator with "perfect" being a slight haze.

If it blows clean without a turbo, the extra air does nothing but blow out the exhaust. Would have to add more fuel, which is usually done with a different injection pump and injectors. Unfortunately not only can this get expensive, but maybe unavailable for obscure engines.

A lot of people try to use throttled gasoline knowledge in a throttleless timed injected engine. More fuel-more power UNTIL you hit the black smoke limit and have no more excess oxygen left to consume fuel.