3400 block and 2.8 DIS crank make a 3L rev monster?

The Dark Side of Will · Wed Dec 15, 2004 8:21 pm

Lots of little birdies say that...

Shaun41178(2) · Post by **Shaun41178(2)** » Thu Dec 16, 2004 2:42 pm

donk_316 wrote:o

Shaun! Wanna hog out some 3400 heads for me? ZOOM!

Sure. You know I have a set. One is already done. Been lazy with the other. Have 3400 itnakes too. NEW!

donk_316 · Post by **donk_316** » Mon Dec 20, 2004 6:04 pm

Wouldnt want to take a set of BRAND NEW 3100 heads on partial trade would you? lol!

I have a 3400 lower but do need a plenum....hell i should really grab a 3500 upper they are only 175 cdn new from GM.

The Dark Side of Will · Mon Dec 20, 2004 6:57 pm

Make yourself a starship enterprise upper...

donk_316 · Post by **donk_316** » Mon Dec 20, 2004 7:10 pm

I was on that route before i decided to boost this engine. I decided that the plumbing (all though it would look ubertrick) would be too much hassle.

Although I do have access to a "prototype" twin TB built by the "wheel standing fiero" guy.

donk_316 · Post by **donk_316** » Thu Dec 30, 2004 1:12 pm

Just an update.

I emailed EAGLE as they actually have a listing for a small journal 6" rod. A set of 8 for 600 usd ish.

Definately worth it if i can get a set for 500 bucks.

I asked them what they would charge for a set of six and if they would be willing to narrow the big end.

As i get info ill post it.

I wanna build this motor now!

The Dark Side of Will · Thu Dec 30, 2004 1:45 pm

donk_316 wrote:I emailed EAGLE as they actually have a listing for a small journal 6" rod. A set of 8 for 600 usd ish.

Yipe!
The Eagle rods for my Northstar were only $475 for the set...
Those ought to be some hellacious rods for that price. I'm curious that those Eagle rods are so much more expensive than mine.

From whom did you get the quote? Eagle directly?

donk_316 · Post by **donk_316** » Thu Dec 30, 2004 3:10 pm

Will. Here is the email i just recieved from Eagle.

"I would recommend our standard 6.000" small block chevy rod. Part number CRS6000S3D. A set of 8 of these rods will actually be less expensive than 6 singles. We do not modify our rods for custom applications - you will need to have that done locally. Those sell for $625 per set. Thanks."

These are their "forged 4340 ESP H-beam con rods" They suggested those over the typical I-beams cause i told them i wanna see 10,000 rpm and 500hp.

I have found a few aftermarket dealers who have them listed from $499usd to $599 usd a set.

My concern is narrowing the big end on a H-beam rod. But thats the one they recommended.

Hey I just had a thought. If 4 of us want aftermarket rods, we should get together and buy 3 sets of SBC rods so they will only cost 350 a set! Whos in!!??

The Dark Side of Will · Thu Dec 30, 2004 8:21 pm

Mine are the 4340 H-beams, too...

$350 a set sounds pretty reasonable. Im currently tearing down a TDC to rebuild as a 3.1. I could be down for a set at that price in a couple of months.

donk_316 · Post by **donk_316** » Fri Dec 31, 2004 11:42 am

Hey for sure. All we need is 2 other guys ( Shaun should jump on board....Levi too) and we are good to go. I was thinking in the spring also.

crzyone · Post by **crzyone** » Fri Dec 31, 2004 3:18 pm

I'm in, pending I don't find a N* before the spring.

Shaun41178(2) · Post by **Shaun41178(2)** » Sun Jan 02, 2005 4:33 pm

$350 isnt' bad.

My only thing is then having to get a crank as I only have 3.1's laying around.

And then custom pistons.

It would be nice to have a destroked motor in a way but I was only planning on overboring my al block .030 anyways. Taking a 3.4 block already and using the 2.8 crank makes a bit more sense. I mean I would prob see some gains, but I would still only be running on 2.8 liters as opposed to 3.0

I am also far from building this engine. STarting a new job which is 5 days a week 9-5 doesnt' leave me much time to do it. Nor does not having a garage and stuff to do the swap.

I picked up some parts I need from Mike L while I was in MD. Some brackets and such that would need to be modified so I can at least get those test fitted to see what all needs to be done.

The Dark Side of Will · Sun Jan 02, 2005 9:29 pm

oughta be able to get 2.8 DIS crank (or whole freakin' engine) pretty cheap...

How much would custom pistons cost? What brand do people normally get?

Since we'll be using SBC rods, we could get Chevy 262 pistons, which have a bore similar to that of the 3.4... just raise the pin...
Again split 3 sets 4 ways...

The 262 has a 3.671" (93.24mm) bore. The 3.4 has a 3.622" (92mm) bore. The 262 piston would also be close for the Northstar and Q4, which both have 3.661 (93 mm) bores. Just need to find a mfg that is willing to supply raised pin pistons without much extra expense...

And if we got in on a group purchase, we'd all need to decide on the same kind of pistons...

Shaun41178(2) · Post by **Shaun41178(2)** » Sun Jan 02, 2005 10:23 pm

Custom pistons are going to be expensive. Esp when you have to move the pin height as well as Compression height.

I am sure companies wont' do a cast custom piston nor a Hyper one either. Prob have to go forged. Expensive to go this route.

Prob around $5-600 for six custom pistons and pins.

Spending a bit more on the rods to get a custom height like was mentioned earlier of of 6.050 according to will and you can then go with a cast piston replacement or hyper. This route would be cheaper and with a hyper piston still provide enough strength for higher hp levels.

I would like to use a 3.1 piston for a gen 2 head with 9:1 compression to allow for boost later on. I am sure some might want to go higher compression or different bore size or what not. This would yield that each person would need to choose their own piston. Unless we can get something off the shelf to work.

I am not sure if the 262 piston would be worth it as it already needs to be modified. We need to find something completely off the shelf that can be used in a 3.1 through a 3.4 bore. I woulndn't mind sticking to a small bore. I dont' need it to be a 3.4 at all.

The Dark Side of Will · Sun Jan 02, 2005 11:06 pm

I was just thinking that I want to build a 3.1 TDC, so I'd need flat tops, which would be crazy for the rest of you, especially those using aluminum heads...

I guess we'll each have to get our own pistons...

262 would use standard Chevy ring pack, though... but it would have to have 4 valve reliefs for the TDC...

crzyone · Post by **crzyone** » Mon Jan 03, 2005 1:21 am

Will, what is the reason for wanting to destroke your tdc? Are you doing it for more rpms? How high are you looking to rev that thing?

CliffDick · Post by **CliffDick** » Mon Jan 03, 2005 8:33 am

Chevy 327=1.75

The Dark Side of Will · Mon Jan 03, 2005 8:57 am

Mostly for the hell of it...

A 3.1 TDC with flat tops would have a compression ratio of about 8.5:1 and a rod ratio of 2:1 along with accompanying detonation resistance...

Shaun41178(2) · Post by **Shaun41178(2)** » Thu Feb 03, 2005 8:56 pm

http://cgi.ebay.com/ebaymotors/ws/eBayI ... 11071&rd=1

guy says these are 5.9 length.

So with those pistons with the 1.242 CH this brings the piston how far from the deck?

I will try to figure this out.

I dont' really plan on getting these but I came across them by accident.

Not even sure if the rod journal is the correct size.

Meh

Shaun41178(2) · Post by **Shaun41178(2)** » Thu Feb 03, 2005 9:06 pm

The Dark Side of Will wrote:That's correct...

Who in the hell made those pistons and for what? With 76 crank and 6" rod, they'd be 0.079 in the hole... with 84 crank and 6" rods, they'd be 0.078 out of the hole... WTF?

With a 5.9 inch rod, the forged pistons I posted pics of before would then be possible with an 84 mm crank correct?

With a 6 inch rod they are .078 out of the hole but with a 5.9 inch rod they would then sit .1 lower in the bore.

Making the new deck height -.022 meaning the piston now sits .022 below the deck surface correct?

SO a 3.1 crank witha 5.9 rod and a 1.242 CH piston right looks like it could work yes?

Then just shave the block deck .010?