4bt intake and exhaust

[1340]

I'm in the process of planning a 4bt engine swap. I don't plan on bombing it (well later maybe). Does anyone have any suggestions for air intake (filter?) and exhaust (3",3. 5" or 4") Thanks.

 

[Forrest Nearing]

BHAF intake filter



4" exhaust (why not, right? )



Forrest

 

[1340]

I've been told 4" exhaust is too big for a 4bt

 

[Forrest Nearing]

I've been told 5" exhaust is too big for a 6bt



that didn't stop me



if it's going to be relatively stock, 3" will probably be your best bet... but these things never stay stock for long



3. 5 will probably cost you more than 4" as it's less popular in the big truck world... personally, I'd go 4"



Forrest

 

[driverswanted]

How can an exhaust be too big/

 

[ezcurra]

Doesn't too large an exhaust, with too low back pressure, hurt exhaust gas scavenging?

 

[moparguy]

My thoughts on a W150 conversion is to use stock exhaust off a 2nd. gen B5. 9. I've got one behind the shop just waiting.



Intake, I'd go with a Fleetguard BHAF.



What are you planning to install the 4bt in?



RJR

 

[Forrest Nearing]

Originally posted by ezcurra

Doesn't too large an exhaust, with too low back pressure, hurt exhaust gas scavenging?

on a naturally aspirated gas engine? yes...



on a turbo diesel? no so much... it can stall the exhaust flow a bit, but not bad enough to worry IMHO.



Forrest

 

[1340]

I've got a '91 Dakota 4x4, lifted 16", 1 ton axles, running 35" tires.

Need more power, hence the 4bt swap.

 

[driverswanted]

1340,



Looks like you have plenty of lift to clear the front axle. I know someone who did the 2x4 '91 Dakota with the 4bt. Have you seen his pics posted here? He had to make a custom oil pan to clear his steering but then he has stock tires and not special lift done. I've been keeping close contact with him for my '85 Prospector short-bed project.

 

[1340]

driverswanted,



Yes, I'm aware of that swap. I have been in contact with him also. I will be able to use the engine just the way it is.