Hi Everyone,

Does anyone know if there are physical dimensional differences between the 3R, 4R, &5R heads..?

I am going to create a CAD file by scanning them into Solidworks, as part of my engineering mock up for the Twin Screw Supercharger setup, I am determined to have my setup fit under the hood, and I think I can do this with some very minor revisions to my current design.

In addition, I am in negotiation on the purchase of another car, and want to have the setup on that car use the LH by fitting it all under the hood..! (This has ticked me off long enough, and I am determined to do this the tight way, therefore the CAD cylinder head....

This new design would allow using a Sharktuned LH and EZK with single 42# injectors, Stock TB, wiring etc. (Just in case someone wants to have a set built for them, and give me a chance to recoup some of the small fortune I am spending to get this done. If not, that's also fine, as I am going ahead with the build..)

Anyway, I am going to use the Motec on my current car with dual injectors per cylinder, and use the LH on the other car. The LH version will retain the stock fuel rails etc. so it can be friendly to the stock setup.

I want to know if I need to borrow extra heads to have scanned. I have an extra set of 3R's that I will be using to model the intake manifold setup etc..

Help is greatly appreciated...!!!!

Thanks in advance..!

 

What do you need on the heads for dimensions? The spacing and shape of the intake ports? Or also things like the distance between the 2 heads in relation to the port entries?

 

Hi Brendan,

I need quite a bit of information actually. Angles and shapes of the intake side of the valve covers, and distance from the intake port opening ledge to the top of the VC, the protrusion dimensions that is midway on the intake side of the head..

I could go on, but it would get quite long.. I basically want to know if the exterior of heads are physically different.. I am not getting into valvetrain and such, although with a CAD model, it will be possible.

I need full exterior dimensions, so I can fit the intake runners, coolers, SC mount, and all the ancilliaries in CAD, and see if they clear the hood. I think I can make the thing about 8 inches tall, and flat with the ledge of the intake ports. However, there are lots of protrusions, and lines, like the heater, etc. that I need to account for..

PS... I have already scanned the stock intake to be able to port match the runners to the head, and will scan the 3R head this week.. I just bought another motor, but don't know if it's a 3R, or 4R headed motor, and won't know until I receive it off the truck in a week or two..

If you want to chat further please send me a PM, I appreciate the input.. This is very important to me for fitment and clearance purposes.. Maybe you have a few heads lying around, and could tell me just by looking at them...?

Thanks again,

 

Richard:

I have a pair of bare 5R heads. You are welcome to borrow one to measure and model.

I believe you will find the basic castings and external dimensions the same. From observation, the ports have different machining near the intake gasket face and the 5R's have the extra coolant hole on the deck side.

Let me know if you want to borrow the 5R head and we can figure out a way to hook it up with you.

 

You will also need to know the true dimensions and relations as the heads site angled on the block and where the hood slopes down past the area. Trust me, I have been though this.

All I have are most of the dimensions of the port placement and shape. Nothing on the area above the port where the oil rail protrudes from the heads in the casting - this is an area that you may wish to be aware of. Sorry I could not help more.

 

I've got a pair of 4R heads I could strip naked and loan one to you- I'm coming to the bay area in late December, or if thats too late, maybe someone's headed up the 5 from here. (When is that NorCal LeMons race....?)

 

Brendan,

Yes, exactly, that's why I am using a scanner. It can scan the entire car if I wanted to do it.. If I need to, I will scan the hood, and fenders with the engine in the car, and cut a cross section in the computer, and measure the clearances..

I have been there too...! That's why I am having stuff scanned.. Believe me, I will do my darndest to make it fit with the coolers, and I think I have a very good chance to get it to work with a fiddle here and there..

The compressor (MX422) fits face down with clearance over the water bridge, no reason why it shoudn't fit face up. The key is packaging the outlet and coolers and injector blocks appropriately. I think I am pretty close, and will find out in a few days.. (I am also scanning the water bridge as well..)

Thanks anyway,


Jim,

You have a PM..


Rob,

December is too late, I want this done this week. Thanks very much for the offer though..! I appreciate it..

Best,

 

So,

I made some tweaks, and the rough scan of the manifold that mates to the head is now partially incorporated into my design. It still needs a few tweaks, and I am not there yet.. Details schmetails..! Oh well..

You can see the compound shape on the bottom face of the lower plate, which will be bolted to the heads..

Legos were good practice for this....

Comments welcome..