blown 944

Finally making some progress onmy next build. For those who are unaware of my last build you can find it here. It was a fun year and overall, I am very happy with the results.

With the new engine I decided to go right to a 16 valve head. Initially, I was just going to build another 2.85 using a 16v head. However, Dave with FRF had been working on his new block design. Through our colaboration we came up with a larger bore option. I will let him disclose the specifics of the block.

Hopefully, It will meet my goals this year. I would like to run around 140MPH in the quarter along with some DE events and be able to drive it daily.

I did a quick mock up this afternoon and so far all clearances are looking good.

The parts used are:

-FRF 2.5 block . Ductile iron flanged sleeves and closed deck. 4.155 bore
-offset ground 3.380" crank (from last engine)
-Wiseco custom pistons with plasma moly rings
-Eagle mitsubishi rods
-ACL race coated rod bearings
-Porsche mains
-944S head and stock cams. First go round the head will be completely stock. I will be pulling the head after a short while to do some port work, add stiffer valve springs and coat the exhaust ports
-FRF custom header
-Dave McGrath built intake manifold
-BMW throttle body
-Holset HX 40 super turbo


Initially, I was going to go with 9:1 compression. However, I am going to go ahead and go with 7:1. If it feels too sluggish I'll change them down the road. The rational is that we can crank up the boost and push the limits safer.

So here are some pics of the block and a little of the mock up. (the piston used is not the final part)


I'll update as progress goes. I'm planning on having the engine in the car in a couple weeks.

refresh951

This is awesome! I like the low compression. Also, I like the rod/stroke ratio of this 3L (1.74). Looks to be another great build Sid.

gruhsy

Very cool. Thanks for sharing.

Reimu

That block looks slick
Was anything done to your last head?
Also would it really be worth coating the exhaust ports? Nobody seems to care when they use n/a heads on turbos

alxdgr8

Interested to see the results with 7:1, seems awfully low even with it being 3.0L

blown 944

yes, I did the porting on my last head. I picked up 5-7mph IIRC.

I have used an NA head on a turbo before and it does slow down the spool a couple hundred RPMs. No big deal for the track, but for street, it can be a pain.

I'm hoping the added cubes will overcome the low compression and lack of ceramic coating.

MooreBoost

That's a nice looking block!!!

333pg333

Looks great Sid. Very promising. Did you go for the 2.5L head for any specific reason? What difference is there in those cams vs S2 or 968? Look forward to seeing the intake. What's the BMW t/b..70mm?
Be interested to see just how much timing/boost you crank into it. Has it got squirters? Stock headstuds?

lol....you'll probably have your motor up and running before me.

Duke

Very cool project! I like the deckplate, will be interesting to see how it works out with different expansion ratios etc. I personally don't like the super low compression, but since you're doing it I want to see at least 30-35 psi of boost on that engine

Dutch944

Damn this is a nasty build! I'm still waiting for the pistons from Wiseco, taking way too long..

I'm also curious about the headstuds. I just got myself a cheap set of ARP studs for the bottom end and i wanted to get a set for the head as well!

blown 944

Patrick, I picked up the 2.5 head for cheap.. So that's what I went with.

TB is 67mm iirc

ARP head studs

No squirters yet. Honestly, I havnt even looked at the cam specs yet. Once I get some numbers out of it, I'll start looking into dual gears and what cams to go with. Generally speaking, I like to start simple with these builds and once the basic function is established, move onto the fiber points. Ie; 2.85 proved put the offset grind concept. Next, prove out the bigger bore and deck plate. My next step is to install the longer stroke crank, and finally the "BIG" bore block. Who knows though, the last engine ran so good I may stop here....lol

Plan is to start at 20 psi and creep up on it.

I am apprehensive about the compression too. However, Josh likes the idea and I would like to see how it works out. To use a comparison, my sons talon is drive able with mid 7:1 compression and it's a 2.0L.

If anything, it is the safer route.

URG8RB8

Damn nice job on the deck plate, now I am not so dissappointed about not getting the 3.0L from Lart! I have been waiting for somebody to add a deckplate. This is the first time I have seen on a 951. Honestly, I think this is safer than the siamesed 3.0L design. there are other nice differences on the 3.0L block though, including the squirters, but those can be added to this block as well. Does FRF offer a deck plate for a 3.0L block as well? That might be the ultimate design. Could benefit a big build like Duke's.
What are you using for intake and exhaust manifolds? Cylinder vibration has to cause many HG's to let lose at our increased boost levels.

Sorry, I see your manifold selections now.

eman930

Dude thats sick, That deck plate looks amazing!!!

86 951 Driver

Looks like fun. 7:1 sounds low, but I guess with enough boost it should be fine. Have you addressed for sure the #2 bearing deal with the smaller rods?

chrenan

This is great stuff, I love it. I finally got my car on the road with the FRF headers, they're great. This FRF decked block is neat too, need details!!!