Importance of CFM air intake

[86Howard]

Just curious on your thoughts.
I have been running a volicety stack without a flame arrestor.
I don't want to get hassled by the patrol.
Cheched into a single aluminum scoop but was worried if it could flow the cfm's I need for a 950, soon to be 1050 this winter with the new build.
Talked to GAFFRIG they said 10" × 3" is what they recommend, won't fit into a scoop.
I have always had scoops but kinda strange looking not having one.
What do you think?

 

[stokerwhore]

looks good to me.

 

[4Waters]

Since it's not an enclosed engine compartment I don't think you are required to have a spark/flame arrestor.

 

[86Howard]

Since it's not an enclosed engine compartment I don't think you are required to have a spark/flame arrestor.

I am in California.
I didn't think so either until I read the law unless I read it wrong, all boats must have a flame arrestor.

 

[Willie B]

...I can’t remember for sure but...I thought not required when not enclosed???...I still use them as sometimes an unexpected backfire can do folicle damage...

 

[Racey]

Easy way to find out, run it, see what kind of RPM you can pull, then take it off, if you pull any more RPM you've found your restriction.

You can take a layer of the wire out if you want to flow more air as well.

 

[Dkahnjob]

I like it, I think it looks good.

 

[86Howard]

Easy way to find out, run it, see what kind of RPM you can pull, then take it off, if you pull any more RPM you've found your restriction.

You can take a layer of the wire out if you want to flow more air as well.

GAFFRIG said it will suck more than I need they use them on a lot of race boat back from where they are from.
If I don't get the rpm s with the new arrestor I will definitely post back.

 

[Backlash]

The entire boat looks terrible. I'll take it off your hands for no charge if you'd like!





I've copied, pasted and cropped about every picture I've seen of this boat. I love this color of blue!!! Just know that you're motivating me when you post pictures of this boat up!

Thank you! I love the boat!

 

[BamBam]

Just curious on your thoughts.
I have been running a volicety stack without a flame arrestor.
I don't want to get hassled by the patrol.
Cheched into a single aluminum scoop but was worried if it could flow the cfm's I need for a 950, soon to be 1050 this winter with the new build.
Talked to GAFFRIG they said 10" × 3" is what they recommend, won't fit into a scoop.
I have always had scoops but kinda strange looking not having one.
What do you think? View attachment 669972 View attachment 669973

First, The boat looks great. My dad owned that boat for a while and it had a twin turbo small block in it at that time. Second, I believe that a velocity stack is legal in CA because it is an open engine compartment and the stack will direct the backfire up and away from the bilge. Third, I run that exact same Gaffrig in my 548 but as Racey said I had to remove some of the layers of mesh out of the inside to get the desired airflow. I would recommend what Racey said about running it and noting MPH and RPM then run with it off to see if there is a difference.

 

[86Howard]

First, The boat looks great. My dad owned that boat for a while and it had a twin turbo small block in it at that time. Second, I believe that a velocity stack is legal in CA because it is an open engine compartment and the stack will direct the backfire up and away from the bilge. Third, I run that exact same Gaffrig in my 548 but as Racey said I had to remove some of the layers of mesh out of the inside to get the desired airflow. I would recommend what Racey said about running it and noting MPH and RPM then run with it off to see if there is a difference.

Thanks, that is what I plan on doing running it and see if there is a difference on the rpm.
I haven't took the GAFFRIG apart, yet, but I like the idea of taking some screen off.
The screens look like they are spot welded together.
How did you remove some of the layers of screen?
Any history on the Howard?
I brought it back from Alabama last year.
The owner new nothing about v drives and the boat needed a lot of attention to get it back to where it is now.

 

[86Howard]

The entire boat looks terrible. I'll take it off your hands for no charge if you'd like!





I've copied, pasted and cropped about every picture I've seen of this boat. I love this color of blue!!! Just know that you're motivating me when you post pictures of this boat up!

Thank you! I love the boat!

Thanks, I really am happy to have the Howard, it's a blast to drive and gets it!

 

[BamBam]

As far as removing the screen goes, remove the button head allen bolts and separate the top and bottom. There are actually two types of stainless mesh. The outside ring is a wider mesh that is spot welded. The inner mesh is tighter weave and coiled in there, the inner mesh is what you would cut down to remove. There may actually be an inner mesh that is the same as the outside that is also spot welded. If that's the case you want to remove the middle stuff.

The history on the boat; My dad bought it in 1993 from the original owner in La Mirada (or close to there). Dad used it for several years and I ended up re-rigging a bunch of stuff on it and adding the oil cooler and balsa floors in the late 90's when I was working at Schiada. I liked the way it was set up with the cable steering. Like I said it had a twin turbo Small block in it and it ran pretty good for a low boost pump gas set-up. He sold the boat around 2000 to a guy they called "Cowboy" who ended up building an incredible 21' Schiada. He had changed a few things and had the trailer painted yellow, but seemed to still be fairly close to how it was set up when we had it. After that I lost track of where it went. I did see it listed for sale on "Racingjunk" out of Texas I think a couple years go and it had the BBC at that time. Only other history is it has a hull/gel repair on the port side just forward of the driver where mom and dad got hit long ago. Schiada did the fiberglass and gel repair at that time (late '93 or '94). Hope that helps a little. I always liked that boat. It was a fun boat to drive.

 

[BamBam]

Sorry about the pictures of pictures kind of a cheesy way to do it, but you get the idea.

 

[86Howard]

As far as removing the screen goes, remove the button head allen bolts and separate the top and bottom. There are actually two types of stainless mesh. The outside ring is a wider mesh that is spot welded. The inner mesh is tighter weave and coiled in there, the inner mesh is what you would cut down to remove. There may actually be an inner mesh that is the same as the outside that is also spot welded. If that's the case you want to remove the middle stuff.

The history on the boat; My dad bought it in 1993 from the original owner in La Mirada (or close to there). Dad used it for several years and I ended up re-rigging a bunch of stuff on it and adding the oil cooler and balsa floors in the late 90's when I was working at Schiada. I liked the way it was set up with the cable steering. Like I said it had a twin turbo Small block in it and it ran pretty good for a low boost pump gas set-up. He sold the boat around 2000 to a guy they called "Cowboy" who ended up building an incredible 21' Schiada. He had changed a few things and had the trailer painted yellow, but seemed to still be fairly close to how it was set up when we had it. After that I lost track of where it went. I did see it listed for sale on "Racingjunk" out of Texas I think a couple years go and it had the BBC at that time. Only other history is it has a hull/gel repair on the port side just forward of the driver where mom and dad got hit long ago. Schiada did the fiberglass and gel repair at that time (late '93 or '94). Hope that helps a little. I always liked that boat. It was a fun boat to drive.

Thanks I really appreciate the history and the pictures you sent.
I went out to Alabama last September to bring the boat back.
Jim Ingram, I think was Cowboy if I am correct, sold the boat less than 2 years ago to a guy in Alabama who sold it to another guy in Alabama who I purchased the boat from.Jim Ingram had Kim Barr in Texas build a 555" engine, with a dyno sheet.
The guy I bought it from didn't know anything about v drives and was scared to death of it and wouldn't drive it, only in the water a few minutes he said.
Got the boat back, checked over a few things took it out to test, wouldn't suck water, took the boat out pulled the water pump cover off and wrong size impeller, too short.
Long story short, found distribution clamp upside down, wrong impeller, plates were not even close, not preloaded etc.
I pulled the engine sent it to Mike Lewis Engines in laytonville, took everything out the boat except the gear box, wiring plumbing.
Noticed a repair port side where you explained, thanks for letting me know about that.
By the way just curious was that a hit on the water or towing?
Found the engine had a bent valve on the dyno.
Took apart found lifter stuck, block wasn't machined for the lifters.
Wrong size push rods, and intake rockers, girdle old style bent rocker arm studs when tightened.
Put it together and dynoed it and was a low achiever for a 555", not even close to the dyno sheet from Barr.
Going to pull it out this winter and tear it down and start over, 565" , 582" not sure yet. Looking for 750 ish hp, will see.
I did put the rod and ends on the v drive gear box plate, wanted it solid.
I did have a chance to run the boat before I took the engine out, talked to Harold kindsvater he sent me a 11 3/4 × 15", and 16" his last props he had that size, he and Lee developed that prop for that hull.
Put the 15" on with a new shaft ran it to 6200 rpm with 22 gear and was still pulling, it bit hard and was pretty quick , I was impressed, not sure speed I was holding on like a cowboy with the plates not even close, that was a ride, LOL.
I have had it out after fixing the engine and setting the plates , I had Bill Diez build me a 3 blade and it rides real nice now I am very happy with the boat.
I can wait to put the 2 blade back on!
Thanks again for all the information and history!

 

[Boat 405]

You’d be surprised how little change you see with some of these spark arrestors. I’m running a Gaffrig 10” x 2” tall screen type on my 800 hp 540. I’d run one taller if I had the height, but I don’t. We ran it on the dyno with and without. Almost no hp loss.

And more importantly no issues with air fuel ratio.

 

[86Howard]

You’d be surprised how little change you see with some of these spark arrestors. I’m running a Gaffrig 10” x 2” tall screen type on my 800 hp 540. I’d run one taller if I had the height, but I don’t. We ran it on the dyno with and without. Almost no hp loss.

And more importantly no issues with air fuel ratio.

Good to know thanks

 

[Kyote]

As far as removing the screen goes, remove the button head allen bolts and separate the top and bottom. There are actually two types of stainless mesh. The outside ring is a wider mesh that is spot welded. The inner mesh is tighter weave and coiled in there, the inner mesh is what you would cut down to remove. There may actually be an inner mesh that is the same as the outside that is also spot welded. If that's the case you want to remove the middle stuff.

The history on the boat; My dad bought it in 1993 from the original owner in La Mirada (or close to there). Dad used it for several years and I ended up re-rigging a bunch of stuff on it and adding the oil cooler and balsa floors in the late 90's when I was working at Schiada. I liked the way it was set up with the cable steering. Like I said it had a twin turbo Small block in it and it ran pretty good for a low boost pump gas set-up. He sold the boat around 2000 to a guy they called "Cowboy" who ended up building an incredible 21' Schiada. He had changed a few things and had the trailer painted yellow, but seemed to still be fairly close to how it was set up when we had it. After that I lost track of where it went. I did see it listed for sale on "Racingjunk" out of Texas I think a couple years go and it had the BBC at that time. Only other history is it has a hull/gel repair on the port side just forward of the driver where mom and dad got hit long ago. Schiada did the fiberglass and gel repair at that time (late '93 or '94). Hope that helps a little. I always liked that boat. It was a fun boat to drive.

As I recall the bottom was also speed coated.

 

[86Howard]

As I recall the bottom was also speed coated.

I stopped by Dave Connelly's shop on the tow home and had him take a look at the boat.
He said said someone did a good job on the bottom.

 

[BamBam]

So I saw a photo on Facebook that you had it out with the new Flame Arrestor. What were the results of the scientific experiment?
Hope it runs as good as it looks

 

[86Howard]

So I saw a photo on Facebook that you had it out with the new Flame Arrestor. What were the results of the scientific experiment?
Hope it runs as good as it looks

Took it out for a little shake down after doing some drive line work on it, also trying a new Bill Diez prop.
Took it easy because I had my lady with me, she let's me know when enough is enough for her LOL.
All in all good, that flame Arrestor will flow plenty of cfm I don't think it will be a problem.
And I like the looks and quality of Gaffrig.