Building a slightly tweeked 2v drysump motor

Thank you very much Dave!!!

 

Pardon me if this was already answered. I have skimmed through the thread but not read every entry.
My question has to do with Cost. or relative cost.

Is this engine rebuild costing more or less using these modified or alternative parts than using all the stock 308 parts. It is a very interesting thread concerning what will fit. Also, I would figure that it is easier to get 360 parts as they are more recent and plentiful than 308 parts.

Plus the added strength in the engine is a bonus.

I was just wondering if it was going to save any money over a regular build or cost more.

Thanks
Charlie

 

Yes there are always surprises! Sounds like everything is coming together and you can see light at the end of this project. The cam verniers sound very interesting. Did you male them from the original cam gears? The only difficult part of degreeing these cams is moving the silly cam gears around.

 

Is there no windage tray in the dry sump motors?

 

The "crank cover" you're referring to is what I was thinking about when I said windage tray ... it's on all the 308 wet sump motors and I trimmed one of mine to work with my dry sump set up ... interesting it's not on the dry sump 308 cars ... I was under the impression that even with a dry sump system management of the air/oil around the crank is critical even if there isn't a gallon or two of oil sloshing around below it.

Sounds like you're saying the crank cover is on the 360 motors even with the dry sump.

cheers

 

Cool pic of the 360 pump/internals.

Your block looks like it has the same mounting points as the wet sump block ... sorry to be the one to point that out . The tray mounts to the 2 bosses on each side on the inside of the pain rail.

Maybe someone can comment on the importance ... seems like it is kinda ... especially since you're going for power ... not just a "rebuild".

cheers

P.S. Send me that 360 lump and I'll make a couple of adapters to bolt it onto a 308 gearbox .

 

wow that block is definitely unique ... thanks for sharing that.

 

I forgot the diff is going to be in the way back there ... sounds like you've got a plan.

I got some itteration of the new Chevy block that has a dry sump from the factory for which I laid out adapters to use the 308 gearbox ... I just can't bring myself to spend more on a Chevy donor lump than I spend for a core 308 motor ... and I just got told I could have a complete 348 drive train (engine and tranny) for $5k ... I'm having trouble saying no to that one.

cheers

 

no

 

Dave,

Can you tell me how many teeth are on the 360 pump sprocket? I might have to man up and make sprockets from scratch for what I've got going on but thought the 360 part might work.

Also, can you tell how much speed reduction the 360 pump has? ... drive sprocket tooth count and driven sprocket tooth count?

You've probably sealed up the bottom end now but also curious what the reduction was on the stock dry 308 dry sump setup also.

Thanks,

Sean

 

No windage tray on a 911 (dry sump). The "sump" is so small and deep (relatively speaking) that it's about impossible for the oil pick up to suck air.

 

Here's a pic I downloaded in the past (I think it's one of Dave's)
The 308 pump sprocket has 22 teeth. No pics of the crank sprocket though.

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Thanks Reed ... I know how many teeth are on the 308 crank sprocket ... I'll post that ... I'm very curious if the 360 has more reduction 'cause at higher rpm it's my understanding the pumps loose efficiency.

I put a 25 tooth sprocket on my 308 dry sump setup but I don't have the warm fuzzies about the material so I think I need to make one from scratch ... the sprocket I have might be fine for initial test stand runs though but also thought a 360 sprocket might do the trick.

Cliffbeer the "windage tray" we're referring to is the one that "manages the air/oil around the crankshaft" ... nothing to do with managing the oil around the pick up tubes. Since there are all kinds of "tricks" for controlling the aero of the crank I would think this tray would be some kind of benefit whether or not the motor is a dry sump.

cheers

 

That's a nice tool to be able to borrow .

I'm in touch fairly often with Mke about various topics so I can ask him about that.

There's no way the factory scavenge is 50% reduction from just the sprocket count ... I'll check the numbers on the pressure side but from memory I thought it was about 75-80%.

cheers

 

wow ... very little speed reduction ... I wonder if that's just a packaging issue. EVERY pump guy I've spoken to has reccomended getting the speed of the pump down especially on a higher rpm motors ... I hope to see 10k on some of my motors .... even if it is only for a few seconds .

Thanks!!! ... tooth count would be nice if they are right in front of you.

cheers