91 3800 heads and fuel injection swappable on 3.8L odd fire? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 01-18-2005, 09:52 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Jul 2004
Location: 26 mile & I-94, Michigan
Posts: 42
Thanks: 0
Thanked 0 Times in 0 Posts
89SSE is on a distinguished road
Default 91 3800 heads and fuel injection swappable on 3.8L odd fire?

is it possible to swap the heads/intake/fuel injection from a 1991 3.8L onto an older 70'* 3.8L odd fire buick motor? i have a donor car and want to know if they will bolt on with little or no modification or if they're totally different. thanks for any info!
89SSE is offline   Reply With Quote
Old 01-18-2005, 10:00 PM   #2
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

I can't remember, does odd fire mean the firing order isn't typcal? If the head bolt pattern is the same, and the space between cylinder banks is the same, I suppose it'* feasible, as long as you connect the injectors in the appropriate "odd" order.
J Wikoff is offline   Reply With Quote
Old 01-18-2005, 10:02 PM   #3
Senior Member
Certified GM nut
 
Join Date: Feb 2003
Location: Georgia
Posts: 2,095
Thanks: 0
Thanked 0 Times in 0 Posts
DrJay is on a distinguished road
Default

Yeah, IIRC odd-fire engines had two pistons on each journal..or something along those lines. From what I've seen of the coolant ports just a few years apart, I'd be temped to say 'heck no' but stranger things have happened.
DrJay is offline   Reply With Quote
Old 01-18-2005, 10:03 PM   #4
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Jul 2004
Location: 26 mile & I-94, Michigan
Posts: 42
Thanks: 0
Thanked 0 Times in 0 Posts
89SSE is on a distinguished road
Default more about odd fire

yes odd fire means that the firing order is different. i think it was 1-6-5-4-3-2 but i'm not positive. you know, i never even thought of the injectors being wrong lol, good call. i haven't really thought much about this swap past "do the heads physically bolt on" becasue if it physically fits together i'll figure out the rest! thanks for the reply!
89SSE is offline   Reply With Quote
Old 01-18-2005, 10:04 PM   #5
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

Do you have the block handy? If you have the block, i'll show you some pics of my block, to see if the coolant ports align up. If they do.. yeah they should bolt up. However, the original 3.8L [LG3, VIN "3", in '87 on our B'villes] doesn't bolt up to our LN3'*.. so my guess, is it may not work.

The only problem other than the above is you'd need an ECU to control the fuel delivery system.. and you'd need a helluva lot more electronics on the car for the ECU to create a proper setup. My suggestion.. leave the heads/intake from that old 231 on there. Betcha they flow better than our LN3'* induction system, and if it'* an EGR-Less engine, then those heads will probably flow several CFM better.


-justin
opensourceguy is offline   Reply With Quote
Old 01-18-2005, 10:09 PM   #6
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Jul 2004
Location: 26 mile & I-94, Michigan
Posts: 42
Thanks: 0
Thanked 0 Times in 0 Posts
89SSE is on a distinguished road
Default

the block isn't exactly handy, it'* still under the heads, which is still in the car, which is actually still running and can be driven. it is a 1991 park avenue. i'm not sure exactly what type of system is on the car, if it'* an electronic trans, if it'* sequential fuel injection or not. i haven't really taken a look at it yet. i picked it up for cheap, drove it home and parked it. now someone with an older buick 3.8L (which is currently in a jeep) wants to swap fuel injection onto it because the carburetor doesn't like off camber driving, which he does a lot of. it'* not a horsepower issue, it'* a reliability/driving on a 45 degree angle issue
89SSE is offline   Reply With Quote
Old 01-19-2005, 07:51 PM   #7
Senior Member
Posts like a Supercharger
 
Join Date: Mar 2004
Location: Nanaimo BC
Posts: 190
Thanks: 0
Thanked 0 Times in 0 Posts
projectheavytouring is on a distinguished road
Default

physically ... won't fit... the 3800 is an even block... the 3.8 buick is an offcenter block

as for efi swap... you need to find another 3.8 buick (offcenter block) Ala regal/GN or fwd LG3 (vin 3) H body

the BIGGEST problem with swapping a carb 3.8 buick to EFI is the other sensors... cam, crank, knock, etc etc etc etc

if you want to save yourself some MASSIVE headaches and probabaly some money in the long run... go order one of Holley'* 4bbl truck avenger carbs.. they are made for offroad and being at stupidly fun angles, get a DUI HEI distributor .. and a jacobs offroad ign box/coil/wires set. if your looking for even more power and torque outta the already torquey 3.8 there are odd and even fire 3.8 buick cams available.... a set of LG3 heads and if the LG3 heads fit snag an edelbrock aftermarket intake for the pre GN 3.8 carb regals

should be able to knock that 3.8 up to about 300hp and 375 ftlbs... without having to rev over 5600 rpm
projectheavytouring is offline   Reply With Quote
Old 01-20-2005, 07:39 AM   #8
Senior Member
Posts like a Camaro
 
Join Date: Jan 2004
Posts: 1,166
Thanks: 0
Thanked 1 Time in 1 Post
mkaake is on a distinguished road
Default

and fyi, the odd fire refers to the rods being on a 90 degree crank that was meant for a v-8 (minus a little, obviously), instead of a 60 degree. so when the motor is running, you have fire-fire-fire-miss fire-fire-fire-miss, etc. etc.
with the 60 degree crank, it'* fire-fire-fire fire-fire-fire...

have fun...
mkaake is offline   Reply With Quote
Old 01-21-2005, 05:53 AM   #9
Senior Member
Posts like a Supercharger
 
Join Date: Mar 2004
Location: Nanaimo BC
Posts: 190
Thanks: 0
Thanked 0 Times in 0 Posts
projectheavytouring is on a distinguished road
Default

odd fire - 2 cyl on 1 bank fire, then 2 on the other bank, etc etc etc

aka 1-5-2-6-3-4 (or something similar... I don't remeber the exact fire)

even fire is bank to bank

aka 1-4-2-6-3-5 (again something like that)

and FYI both the 3.8 buicks (odd and even fire) were built off a cut up v8... the buick 350 hense the off center block ...they are both 90 degree V6'*
projectheavytouring is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
are 3.8 L. heads interchangable with 4.3 L. heads? Hay Bay Woody General GM Chat 1 06-21-2010 06:32 PM
uh hee hee fire fire its840 Lounge 8 05-09-2007 08:16 AM
Swappable? mista_sse 2000-2005 4 07-18-2005 07:26 PM
Are grills swappable? ComfyCar General GM Chat 6 06-14-2005 02:23 PM
Odd. Very odd. willwren Lounge 7 02-23-2003 03:27 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:50 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.