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These lowers were not designed to be used with stock intake gaskets. The reason being is that that the stock gasket doesnt fit that well, and you cant modify it to match. They are also tapered, grow when compressed.... just too many variables to get them to work to my standards. I have the file to have gaskets cut, and could have some laser or waterjet cut flat gaskets from more predictable gasket material.
The bolt holes in the flange have plenty of room for thermal expansion, that wont be a problem.
I like the o-ring solution best, but it does get close on the manufacturing side.
Have the o-ring groove pretty well perfected. Its at 22.5% squish, and fits in the groove easily and retains itself for installation without any adhesive.
I think this will be much nicer than a traditional gasket.
Here is the final design. I had to make a couple more quick edits, the largest (apart from the o-rings) was to remove the undercut that was on the bottom under the runner extension and replace it with an end-milling operation. Cost of the o-ring grooves bumped the price a bit, but I will cover this and the cost of the o-rings for these first five sets.
The O-rings that I tested were Viton, so perfect for the fuel exposure.
Also available for those who may need it for their projects are coolant sensor relocation parts. This allows moving the temp sensor on the waterbridge used to send the signal for the dash gauge (not the critical EZK/LH sensor) to the rear driver port normally occupied by the factory block-off plate. There is also a M14 plug that installs almost flush in the
waterbridge. I needed this for one of my projects, so I made several extra sets in case anyone else needs them. Price for these two components and o-rings will be $42. A stock gasket is required for install. I have 5 sets available.
I ordered a stack of the factory gaskets for the temp sensor relocation plate so I can ship them with parts for people. Price will go up according the actual cost of the gasket and the pair of stainless install fasteners (approximately $3) but they will be ready to go when they arrive.
Also, I will be able to offer billet velocity stacks for the 2"-16g tubing. These will have the full variable radius profile for the bellmouth. I am working with the shop now to provide some additional features for easier installation in plenum materials. I will post drawings as soon as I have everything squared away.
Here are the proposed velocity stacks, and two configurations of them installed. There are designed to be installed in a 2.125" hole in .125" thick material for easy fabrication.
How would these look with longer runners? Of course the short runners are for some, but for a more balanced rev range, it seems like the runners will need to be longer.
That was just a quick mockup. The stacks are can accommodate any length. If you are talking about a longer flare, Its something I could do, but will end up costing a lot more per part.
That was just a quick mockup. The stacks are can accommodate any length. If you are talking about a longer flare, Its something I could do, but will end up costing a lot more per part.
No, not the flare. I'm just talking about the midpipe. Just total runner length.
First, anyone can put whatever bellmouths on these flanges they want. Anyone can also fabricate tapered runners which have biased oval profile at turns. There's no requirement for using straight pipe or these bellmouths.
Second, the flow rates between this kind of bellmouth and one with a longer major axis of the ellipse differ by some tenths of a percent. See some testing results by David Vizard below. So while they may not be perfect, at some point the best may become the worst enemy of good.
(The differences are so small that I thought they'd deserve a very small image. The full-size image by clicking or in the below link.)
01-04-2015, 04:26 PM
