Do you want to do a 3900 swap? whats stopping you

Or you could use a VVT controller... Which is my plan if or when I get to the point of using a 3900...

http://www.diyautotune.com/catalog/vvtuner-valve-timing-control-unit-assembled-p-459.html

Also caffeine, have you been getting my PMs? I'd just like to know if you still want to sell the item or if you have changed your mind.

[caffeine]

You could also use a meth controller for the VCT

[ericjon262]

anyone considered mechanical control of the cam actuator? maybe using a wastegate actuator to control a valve, or maybe some kind of governor setup like a distributor uses.

I'm wanting to keep it more active than on/off. though, I'm thinking I'll just use a later style PCM and go DBW.

[caffeine]

AFAIK there's another guy who's already run the VCT with a switched output.

[caffeine]

I'm gonna try running the VCT as an on/off type of switch as opposed to continuously variable PWM. The alternative is locking the cam to one position or getting expensive custom cam bearings/bearing spacers made.

[ericjon262]

I highly doubt it if he's gonna run a '7730. if he is, I would love to know how.

planning to keep vvt?

[caffeine]

Do you want to do a 3900 swap? whats stopping you

what do you forsee as being one of the more challenging aspects of the swap?

I already have a game plan. But the most challenging part will actually be finding a place for a power steering pump since the VVT water pump sits right where I would ideally put the power steering pump. Everything else is pretty standard...
- Flip upper intake
- Use V8/3.1 rad with 3.1 lower rad hose and yet to be determined upper hose
- Use 2.8 headers with new flanges welded on OR source a couple of car 3900 front manifolds with a custom y-pipe
- Custom solid 1/4" steel motor mounts
- Repin stock harness for '7730 and modify pigtails as necessary
- Custom external crank trigger (or purchase one and modify mount)
- Custom T5 front bearing retainer with HTOB mount and dual starter pocket 2.8 bellhousing (already made) (lots of alternative ways to bolt up a T5 as well)
- AFPR for for returnless rail OR vette/S10 fuel filter/regulator
- Notch front crossmember for oil pan clearance

[ericjon262]

what do you forsee as being one of the more challenging aspects of the swap?

I would bet it's all the little custom parts that will come into play.

I might swap one into a drift camaro I recently acquired.

what do you forsee as being one of the more challenging aspects of the swap?

[caffeine]

I might swap one into a drift camaro I recently acquired.

[robertisaar]

If there was a 3900 for $100 in the same yard with the same mileage, would you have picked up the 3900 instead of the Dohc?

didn't get it from a yard... came from another forum member who kept up on it right until he swapped it out for a L67. it was taking up too much storage space, so i ended up with it.

if i came across a gen4 3500/3900 for $100 before or after after the LQ1, i'd still probably pick it up, it certainly couldn't hurt to have around.

anyway to get the timing cover side to have a mount for a FWD setup?

Yes it will bolt on, There are a couple other things that need to be done but lets save that for a different thread if we could please.

why no 3900?

two reasons:

i was able to pick up a well-maintained 100K mile LQ1 and 4T60E for $100 within an hour drive
because the latest 3500VVT is looking more impressive

even then..... the next time i need an engine, the HFV6 lineup is on the table.

If there was a 3900 for $100 in the same yard with the same mileage, would you have picked up the 3900 instead of the Dohc?

[ericjon262]

I've been eyeing up the later gen IV engines for other reasons than just increased displacement. i'm interested in the VVT setup, and possibly a custom cam for single cam variable LSA. it's a project that's still a ways out though. probably once I hit my next duty station I'll get started on it.