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post #1 of (permalink) Old 03-31-2010, 06:51 PM Thread Starter
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Dodge 318 4x4 build. NEED HELP BAD

Please help. i have been building a 93 dodge dakota 4x4 for years now and i still cant seem to get it to run clean. it is very inconsistent. sometimes it runs like i imagined it would when i started the project and other times it falls on it face and gets **** gas mileage. changes day to day start up to start up.

so the truck is like i said, a 93 dodge dakota 4x4, 3 inch lift on 31x12.5 super swappers, with 3.91 gears posi front and back. i kept the transfer-case and adapted a non electronic 92 ram 518a tranny with oil pressure converter locking and OD on/off switch. i took the v6 out and started to build a free 318 i got out of a friends rusting 74 dodge dart with 49,000 miles on it. i did a bottom to top rebuild. block was cleaned, rebuilt, and bored once over. a 7qrt. oil pan, cleaned the cast rods/balanced, new speed pro pistons, 2roller timing chain, cleaned and rebuilt the cast heads/slight polished ports and chambers. headers with a two 2 1/4" into one 3"exhaust at the muffler. Edelbrock performer dual plane no emission intake-manifold with matching performer cam(idle-4500), mopar distributor and ignition (orangebox) and a 470 holley truck avenger carb on a 1 inch space adapter.

i have been trying to figure out why it has no power on the low end torque. this is all i want for my truck, low end. it has a hard time hill climbing, sputters and gags on acceleration sometimes, and no slow crawling/towing torque. i think it might be the fuel delivery (carb cfm, jetting, or power valve?) gearing, or the compression 8 to 1. but why would it run great sometimes.

to be more specific on the problem; half throttle in highway driving up hill, the truck sputters a bit and seems to want more fuel. the same goes for when i stomp on the gas instead of feathering into it (sometime even then). this is why i think its the jetting, maybe the power valve, or could it be my carter mechanical fuel pump. should i get a electric one. WOT on flats/downhill or after 3,500 rpm, the truck runs its best. it likes full throttle. i can feel the vacuum secondaries come in at about 3,400 rpm at WOT.

1st/2nd gear pull hard and when it hits 3rd it falls on its face. right now i have the overdrive switch off. also when hill climbing there is no power and the motor is running hard. could this be something wrong with the tranny? i had climbed the same hill, with the same gears(3.91), with the V6 in the truck. this is why im so baffled. V6 had more torque than this built V8?

the cfm of the carb when calculated out to the motor (500 cfm) was closer to 470 then 670 truck avenger. that's why i went with the small one. plus i wanted better feul economy, but running with a lead foot all the time isn't helping any. im hoping that it isn't the compression or the heads (maybe i polished to much). i know if i get some dome pistons it will help a bunch but i don't want to have to go that far if i don't have too.

so if anyone has any suggestion on what else i could do, fix, or something i messed up on, or missing let me know. i would like all the input i can get. i really want a good truck with torque. Please and thank-you.
Mahalo & ALOHA
maui mopar 4x4 is offline  
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