| From | Message |
gen1dak
Dodge Dakota
JOIN HERE
5/29/2005
17:46:41
|
 Subject: RE: pre mag mods
IP: Logged
Message:
All Thermoquads were rated at 800 cfm on small blocks, and 850 cfm for the bigblocks and a few 360's. Specially prepped bigblock versions could hit 1,000 cfm! The difference was the smallblock version had slightly smaller primaries (1 3/8" vs 1 1/2"). Once the T'Quads were being used on the 318 and smogger 360's, they had a simple restrictor arm (easily removed) that limited the travel on the secondary air door so it wouldn't open fully (so it flowed more like 600-700 cfm). As you can imagine, 800 cfm is way too much for stock 70's and 80's LA's. The HP power ratios hovered around 190HP at 4,000 rpm with 270-280 lbs torque below 2,000 rpm.
For offroad, the AVS, AFB, and the Thermoquad all use the same spring-loaded inlet needle and seat assembly to deal with off-road activities, so it shouldn't be too tough to come up with one. Edelbrock sells off-road kits for their versions of the AFB and AVS. I bet they'd interchange. There are very few differences in Edelbrock's version and the originals. I used a 30-year old set of metering rods from a 60's vintage AFB on an Eddy AFB in the late 80's. Naturally, now, the Edelbrock website says you can't do that, but in '89 there was no Edelbrock website, so it's probably a marketing-oriented thing. Some of the guys on the RC website swear by the Rochester Quadrajet, but then others counter with fuel injection as being even better. A little digging should turn something up. The 9801S (introduced in 1974) was a model specifically aimed at performance and off-road, so it was used in that capacity. The other models would be easily adapted. I have a web address somewhere that lists a restoration place. Gotta see if I can find it.
A little food for thought...
http://www.greenval.info/magstories/demon/
|
gen1dak
Dodge Dakota
JOIN HERE
5/29/2005
23:10:39
| RE: pre mag mods
IP: Logged
Message:
Helpful resource page for the TQ.
http://www.offroadexchange.com/projects/CrtRbld.htm
|
Zac
Dodge Dakota
JOIN HERE
5/29/2005
23:58:08
| RE: pre mag mods
IP: Logged
Message:
so in 85 that truck probably had a quadrajet right? Also do you know anything about the NP435 to NV4500 swap? that would really help mileage wise
|
gen1dak
Dodge Dakota
JOIN HERE
5/30/2005
00:11:15
| RE: pre mag mods
IP: Logged
Message:
Nuts! Yeah, probably a QJet. Looks like they started in 1985.
Tranny swap, eh? Been concentrating on auto tranny swaps. Haven't even looked at that particular swap. However, Mopar typically made transitions to newer trannys pretty smooth. Probably not much more than a shorter driveshaft and matching mount would do it.
|
Zac
Dodge Dakota
JOIN HERE
5/30/2005
17:28:58
| RE: pre mag mods
IP: Logged
Message:
i was hoping it would be that easy. I have heard quite a few people say good things about the Q-jet so i guess its not that bad. One question i have is what is the difference between spreadbore and squarebore carbs and intakes? which one is the q-jet?
|
gen1dak
Dodge Dakota
JOIN HERE
5/30/2005
18:15:18
| RE: pre mag mods
IP: Logged
Message:
The quare-bore is just that. The plenum of the intake (specifically, where the carb bolts down) is square, like Holley carbs, and the current Edelbrock AFB and AVS. The spreadbore has a curvy plenum to match the mounting requirements of the QJet and Thermoquad. The primaries are very small, and fit the normal square-bore outline, but the secondaries are huge, so the mounting surface must curve outward on both sides to allow them to fit. QJet is a spreadbore. The tiny primaries make for a responsive engine and better gas mileage. Two easy examples....Look at the standard Edelbrock Performer intake, then look at the Performer RPM. The standard Performer is curvey to accomodate a spreadbore, but will also allow a squarebore. The RPM is a square bore that requires an adapter to fit a spreadbore. Naturally, the stock 360 4V fits the spreadbore.
|
zac
Dodge Dakota
JOIN HERE
5/31/2005
20:53:34
| RE: pre mag mods
IP: Logged
Message:
i brought the truck home today. 1985 w150 4x4 reg cab long box. 360 np435 np208(i think) it is a Qjet. it only has 145000 km on it. But it has a leak from the tranny. its leaking out the bottom of the bellousing, from a drain hole. what could it be? i think it is the seal on the input/main shaft. i dont know if there is anything else there that it could leak from.
|
gen1dak
Dodge Dakota
JOIN HERE
5/31/2005
22:25:07
| RE: pre mag mods
IP: Logged
Message:
Yep, input shaft seal.
|
Zac
Dodge Dakota
JOIN HERE
6/01/2005
00:27:55
| RE: pre mag mods
IP: Logged
Message:
how hard would that be to change? i know i would have to drop the tranny and t-case but would i have to take the tranny apart? or can the seal be replaced from the outside?
|
gen1dak
Dodge Dakota
JOIN HERE
6/01/2005
23:31:02
| RE: pre mag mods
IP: Logged
Message:
Yeah, you can change it from the outside. Not bad. There's a special tool used to extract the seal...it's in there kinda tight. The more common method is to cut it with a hammer/chisel, or work it out with a screwdriver. The two "backyard" methods can cause damage to the seal seat, so if you do it that way, be careful. Installation is basically just a few gingerly taps until the seal is seated. They suggest a rubber mallet or something less abusive than a sledgehammer.
|
Zac
Dodge Dakota
JOIN HERE
6/02/2005
01:03:53
| RE: pre mag mods
IP: Logged
Message:
im not so sure it is from the tranny anymore. it stopped leaking and i filled the tranny today. it didnt even take a 3/4 quart. it was really black oil that was leaking and the engine oil is really black. need to change it real soon. is there any way that it could be leaking from the engine? also i went muddin today 4x4 works great and i only needed the winch once.
|
gen1dak
Dodge Dakota
JOIN HERE
6/02/2005
23:01:20
| RE: pre mag mods
IP: Logged
Message:
Check the valve cover gaskets (those LA cork-style gaskets aren't great) and the oil pressure sending unit, which is at the rear topside of the block near the distributor. Hopefully it's one of those. They're the most likely culprits. If not, you're looking at a head gasket or oil pan, but those aren't nearly as troublesome as the first two, especially the valve cover gaskets.
|
Zac
Dodge Dakota
JOIN HERE
6/02/2005
23:19:13
| RE: pre mag mods
IP: Logged
Message:
okay thanks. i will check them tomorrow.do you know anything about the powertrax style lockers? the ones that replace the spider gears. i dont want to put a new carrier in right now and those seem like a good idea. also do they make spreadbore to squarebore adapters? i like the carb i have now but i want to get the airgap intake. and for headers i was looking at the cheap summit brand ones. do you know if i would need a different starter because i cant see hoe they would fit in there.
|
gen1dak
Dodge Dakota
JOIN HERE
6/03/2005
00:06:05
| RE: pre mag mods
IP: Logged
Message:
I have seen a little here-and-there on the PowerTrax. At a glance, it seems like a pretty good setup.
Summitracing.com has the EDL-2692
carb adapter from Edelbrock for $33.
Nah, you don't need a different starter, but if you keep the stocker, and it gets cozy with the headers (and it will), see Summit for a wrap-around heat shield (for the starter), or get a newer smaller 90's Mopar V8 starter (yes, the Magnums swap out, no problem). They are smaller, more powerful, (cost more) and have a built-in heat shield.
|
zac
Dodge Dakota
JOIN HERE
6/03/2005
21:32:03
| RE: pre mag mods
IP: Logged
Message:
okay thanks again. youve been a huge help
|
Zac
Dodge Dakota
JOIN HERE
6/04/2005
19:54:37
| RE: pre mag mods
IP: Logged
Message:
is the air gap intake compatible with A/C? i read a little bit on it at ramchargercentral.com but didnt find a whole lot. also what do i torque the exhaust manifold bolts to? i need to put new gaskets on but i wasnt sure of the specs
|
Zac
Dodge Dakota
JOIN HERE
6/08/2005
19:26:40
| RE: pre mag mods
IP: Logged
Message:
are all year 360 heads compatible. i need new ones due to broken exh manifold bolts and wrong extraction techniques. I ve heard that the closer to 92 the better. i have an 85 360.
|
gen1dak
Dodge Dakota
JOIN HERE
6/08/2005
19:39:46
| RE: pre mag mods
IP: Logged
Message:
Yeah, all the LA 360 heads will swap (even the Magnums with a couple other parts swaps). The last of the 360 LA's are the best of the LA's, but you're not giving up much with earlier units. They all have essentially the same max performance potential. The torque figures, well, I never even used them, but I can reference them in a few days. I'd guess around 35-45 lbs. I typically just snug them down, run the engine a while to get the gaskets hot, then cool off and snug a little more. The RPM AirGap will require a little creative modification to mount the AC.
|
Zac
Dodge Dakota
JOIN HERE
6/08/2005
21:18:06
| RE: pre mag mods
IP: Logged
Message:
okay im going to get them ported and polished and intall new springs and 1.6 roller rockers before i put the on. then the air gap intake and 650 cfm AVS Off-Road carb. as well as headers. my old heads arent in great shape either so its not so bad.
|
Zac
Dodge Dakota
JOIN HERE
6/16/2005
00:24:33
| RE: pre mag mods
IP: Logged
Message:
Okay i got some problems with my Qjet. my engine was idling kinda low before, 200 to 300 rpm sometimes, then all of a sudden its idling at 2000 rpm. what could it be. i cant get a new carb just yet so i need to make this one work until i can afford it.
|
| | <<Previous Page P 10 Next Page>> |
