Need more air in engine compartment 42 lightning
 

Hey guys, I am trying very hard to avoid scoops. I need alot more air in my engine compartment and I dont want to ruin the hatches by cutting them up. If anybody has done mods without scoops, if you can send some pics, it would be greatly appreciated. I have a pair of 1200's + going in and last year when I raised the hatches at 4000 RPM, the AFR meter rose by .5 to .75 which is alot at that RPM so just imagine how much more it would raise at 6000 RPM.. Thats quite a bit... Any other ideas would be great too!

1996 42 lightning
Joe

I'll get some pics this weekend. I'm building new hatches now. My third set, first ones were flat, seconds one scoops now ......you'll see

I removed the back off each of the six vents in the bilge.
Also the triangular vents on each side only had one 5" hole and I added a few more
2" ones. I would think your reading differed with adding more cool air to the bilge.

Please send the pics, I would like to see them

Well exactly, we were adding more cool air to the engines. We did the test repeatedly and it was the same result all 3 times at 4200 RPM's. Plus it responds on the AFR meter in seconds each and every time. That meter was the best investment I could have ever made!

I made some better flowing side vents, you can also duct your speaker holes under back seat directly into engine compartment

Nice vents....got anymore pics?

Also remember that you need to get the air out of the engine compartment too. Add good clean air but vent out equally. Great example to see is the stern of Outerlimits GTX......good luck.

Install a vacuum gage hose next to the engine intake and run out the hatch so you can read it.
Close the hatch and go for a ride.
Is there a vacuum in the engine compartment?
If so then opening up the inlets will help...
But it also could open them up too much and pressurize the engine compartment and force engine room exhaust gasses, (carbon monoxide gas) into the cabin.
The cabin is not perfectly sealed like a car or aircraft where the gasses cant make it back into the cabin.
Be very careful changing intake without increasing the exhaust side of engine compartment air/gasses

I had that problem on my old boat with forward facing scoops. Cabin would smell like fuel/bilge after a run.

I like the idea of adding ports/vents on the back of the transom, like these To help exit some air.

Love the Vents Tom! Can we get more pics of the boat??? Coming out beautiful from what ive seen.

+2 that looks really custom, I had posted about this a while back, sick of fixing the glass vents that EVERYONE steps on ... this would solve that problem

On post #222
http://www.offshoreonly.com/forums/g...-t-o-s-23.html

Is a view of the transom of Ron's 412 Skater that he had. I believe the lowdown was 1 exhaust and 1 vent per side - not quad tails for the 1100 turbos that the skater was rigged with

joe here some pics this has been a 2 year project the boat was a triple engine witch I converted over to a twin right now the interior is out getting redone and the exhaust is getting polished ill get more pics out when the boat is finished in april

I like it

killer look defiantly one of a kind.

Looks great Tom, can't wait to see it all done ... I know you've put a lot of hard work into it

Absolutely beautiful! Awesome job! The colors look fantastic! Can I ask who made your side vents etc... Would love for them to do the same for me.. How much hp are your engines if you dont mind me asking? Have you also thrown an A/F meter in yours as well?

Joe, tommy bought it as a bare hull, hasn't ran it yet. I believe his engines will be about 850-900hp??

I can help you make plates just like those he has.

Looks great!!!
Please post more.

Almost ready for primer

Cool! Different that's for sure. Post pics when you get some paint on them.

Will do.

Wow! your boat looks awesome... love the colors and the race faring/windscreen. Not sure where in Wisconsin your are located but I would love to see it on the water when you get it done!

Fountain air vents
 

3/24/13 saw these on ebay.http://www.ebay.com/itm/Fountain-SS-...b5eb4c&vxp=mtr $200 50 1/2 x 5 5/16 Above the swim platform?

Wonder where youd mount that thing?

Transom vent plate
 

I e-mailed the guy and he said it mounts under the transom light and you cut holes in behind where the vents are to let air out of the bilge area. He said that they were on certain 35 models but I have never seen them. He does very nice work, I just bought bilge blower vent covers from him and they are much nicer than the ones from fountain and at a fraction of the price!

There sweet looking but I would worry about water splashing onto the rear motor/distributor

rear vent
 

I agree, I would be worried about water splashing in on the distributor.

looks awesome...:eekdrop:

You don't have a number of some sort of contact info for this guy do you? I lost my vent covers for my 32 and can't seem to find any sort of replacement for them. Maybe this guy could make me a set.

I think this is his ph# 262-939-1171
You could also send him a P.M.

I would love to PM him but I don't know who he is on here. I have picture of what they were like. I could make a template out of cardboard. That and the pictures I believe he could make me something that would work well. Maybe even better looking. Let me know who to PM if you know him.