Back to the basics...

[AH64ID]

I have never heard the HE351 will support lower hp on a 1st gen. Its a 35psi turbo, so it will support whatever 35psi will cool for you.

The housing is smaller than most, but I have also read that the housing on the HE351 is a hi-flow version, or the 9cm on it would be similar to a 12cm from the 90's.

If you incorporate a WG into the HE351 at about 35psi you should have no DP issues. As long as I'm not WOT above 2700 rpms my DP isn't crazy, and thats on a 3rd gen head with a cam, which moves a lot more air than a 12V.

 

[DogramTD]

Nice, I too, like AH64ID, have no use for one but wouold love to have it! Good find!

 

["Mad Max"]

fellas, I'm needing to replace my air filter, and I'm leaning towards the BHAF.



I just wanted to try to summarize some thread searching I've been doing - seems he BHAF is a very good filter across the board, including applications involving boost levels above 40 psi, correct?



I've been running an AFE however it is nowhere near the size of the BHAF, and I can get those locally for a good price. Seems the BHAF is a no-brainer... assuming of course one has the fab skills to make the thing fit . Does my logic sound right?



- Sam

 

[pwerwagn]

Oh... one other quick question. The options sticker under the hood indicates the truck has a 3. 5 gear ratio. All other trucks I've seen of this vintage have either a 3. 7x or 4. 10 ratio for the 4x4? Was this a special order option?



--Eric

As mentioned... even tho this is late, the 3. 73 option was never used by dodge until AAM came into the picture. Dana has always used 3. 55 and 4. 10 is nearly every light truck axle (although you could get 3. 73's in chevy's with dana's).



You truck has 3. 55/3. 54. No dodge prior to 03 will ever have 3. 73's from the factory.

 

[pwerwagn]

fellas, I'm needing to replace my air filter, and I'm leaning towards the BHAF.



I just wanted to try to summarize some thread searching I've been doing - seems he BHAF is a very good filter across the board, including applications involving boost levels above 40 psi, correct?



I've been running an AFE however it is nowhere near the size of the BHAF, and I can get those locally for a good price. Seems the BHAF is a no-brainer... assuming of course one has the fab skills to make the thing fit . Does my logic sound right?



- Sam

Are you having a problem with the AFE? Is it a dry flow or an oiled AFE?

 

["Mad Max"]

I'm doing a 6BT conversion on my '93 Ramcharger, and I don't have a filter for it (other than the stock one that came with the donor truck), and while I am of course going to install one of our own Intakes I'm curious about flow and sound characteristics between the AFE (in my other truck) and a BHAF. I'd be happy without an oiled filter if the BHAF is comparable, and I know the BHAF pretty much out flows everything else...



So basically I am building an air intake system from scratch, and my options are all open - not replacing an existing filter system. I'm planning to fab up a shield box similar to factory (mostly for sound-cancelling), only bigger to accomodate the BHAF if I go that route. Otherwise I'll modify/re-use a factory unit.

 

[cerberusiam]

Yep, an AH19037 plus Outerwears prefilter is about the best there is for flow and filtration. Surface area is what matters to keep the restriction low.



You should be able to get to 50 psi before the restriction gets bad enough to warrant other options. IIRC, the Fleetguard is 1600-1800 CFM at 2 in\hg. For an arbitrary cutoff that seems to work good.

 

["Mad Max"]

cool - thanks Alan - 50 psi is well witin the needs for this particular truck, good deal.

And since it was mentioned, on another topic, my tug boat is going to eventually be sporting twins, and likely will be pushing ~65 psi - certainly over 50 - what is the company answer about an air filter(s) for over 50 psi?

 

[cerberusiam]

what is the company answer about an air filter(s) for over 50 psi?

A sheep. :-laf :-laf









Depends on what you can live with for restriction and how concerned you are about the absolute most air balanced with filtration. Am pretty sure EGT's will be the controlling factor. Dual BHAF's would flow a LOT of air if you have room for them.



If it was me, use the BHAF and put a vacuum gauge in the intake pipe and see what happens when you hit 65 psi. No substitute for hard data.

 

["Mad Max"]

actually... now that I'm thinking about it... I doubt this RC will push more than 25-30 psi, and I gotta believe a stock filter will supoprt that, ja?

 

[pwerwagn]

PSI isnt really where the filter will become a restriction, flow is. A 35 (even a 35 with a big comp wheel) will probably never realistically flow more than 7-800 cfm, so a BHAF should be PLENTY for you.

Of all the intakes ive had on all my CTD's, Ive never noticed an obvious difference from going to one from another, aside from noise really. Perhaps a bit of spool and a tad bit of EGT but nothing drastic.

I have a bhaf on the 93, and it works well. Have had AFE's, K&N's, UNI's... all were fine. I like the paper bhaf tho.

 

[cerberusiam]

Its in the 2nd gen area somewhere, a member posted some claculations that by that set the flow requirements based on 0 in\hg of restriction. IIRC its around 1400 CFM for 35 psi and about double that at 45 psi. The flow requirments double every 10 psi starting at 15 psi.



The AH19037 was approaching its limit between 35-40 psi with a maximum of 2 in\hg of restriction. Raise the restriction limit and 50 psi is possible but not sure what the actual restriction would be without a gauge.



I *think* a BHAF adn 4-5 in\hg would not be a problem but that theory needs tested.

 

[pwerwagn]

I get what you are saying. I guess I should have simply said, an HX35 will never out flow a BHAF?

2 BHAF's would be sweet though.