Author Topic: cvx-18 exhaust (Read 65277 times)

Shrom CVX-18 · « **on:** February 05, 2011, 08:10:50 PM »

OK guys the project started last night. The project started out frustrating because I went to back it in to the garage and my 4 wheel drive in my truck wouldn't kick in. I had blown a path but the thin layer froze and turned in to ice...So My truck ended up stuck attached to my boat. I was able to unhook the truck get it forward enough to get another truck hooked up and get the boat back in to the garage, and get my truck pulled out. Looks like I have another project to deal with on my truck

...ok back to the boat. Today I was able to get the engine out, also the old exhaust. With no problems. Hopefully the rest of the project goes the same way. Here are a few pictures of what is done. Risers I repainted last week.

Hot Carl · « **Reply #1 on:** February 06, 2011, 12:27:03 PM »

Looking good man - keep it up! And sorry about the truck - I feel your pain. My Jeep's 4 wheel drive went out the day before we got blasted with 20 inches of snow. Great times..

Shrom CVX-18 · « **Reply #2 on:** February 06, 2011, 07:32:30 PM »

Here are the risers and S pipes freshly painted, and the tips just waiting to be installed. Before anyone says anything I do have the block off plate I just forgot to add that to the picture.

CVX Fever · « **Reply #3 on:** February 06, 2011, 09:36:22 PM »

Looking good Shrom. Those look like the newer style "dry fit" manifolds that your putting in.

Shrom CVX-18 · « **Reply #4 on:** February 07, 2011, 11:08:03 AM »

Quote from: CVX Fever on February 06, 2011, 09:36:22 PM

Looking good Shrom. Those look like the newer style "dry fit" manifolds that your putting in.

What does the "dry fit" mean? I am new to these terms.

Rosscoe · « **Reply #5 on:** February 07, 2011, 07:39:05 PM »

Did you pull the motor to strictly make installing the thru hull exhaust easier or are you doing more stuff? Dont you need to motor in place to figure out where to cut the holes in the transom?
Maybe you talked about other things you are doing in another thread I havent seen.

Shrom CVX-18 · « **Reply #6 on:** February 07, 2011, 08:13:38 PM »

Quote from: Rosscoe on February 07, 2011, 07:39:05 PM

Did you pull the motor to strictly make installing the thru hull exhaust easier or are you doing more stuff? Dont you need to motor in place to figure out where to cut the holes in the transom?
Maybe you talked about other things you are doing in another thread I havent seen.

Hey no this is it, I don't have another thread.
I did pull the engine for the exhaust. The only way to get at the bolts for the old exhaust that is there you have to pull the engine. While the engine is out though I have decided to clean and paint the bilge area and change my freeze plug. I will also drop the oil pan and clean it out real good. I will also do little things like spark plugs and just general cleaning of the engine. You are right I will need to have the engine for placement of the tips. I will post pictures as that time comes.

Rosscoe · « **Reply #7 on:** February 07, 2011, 08:16:49 PM »

Great time to do that stuff while you have easy access. Should sound bad!
Are you installing any kind of baffles? Expect any trouble from law enforcement regarding sound?

Shrom CVX-18 · « **Reply #8 on:** February 07, 2011, 08:26:45 PM »

No baffles...

lol 4 inch tubing, risers down and out the back. Nah Were I go boating they don't seem to get anyone for having loud exhaust. Plenty of people have it. Watch this year will be there year that they start.

Rosscoe · « **Reply #9 on:** February 07, 2011, 08:36:07 PM »

Cool
4"..are the risers that size or do you have to use a reducer?
I certainly would think there would be a lot less back pressure with 4" but its a short run anyways. My V175 has 3" and I think I'll go with 4" risers now and use a reducer to hook up to the tips. I dont know yet. We'll see how the $$ start adding up. Maybe it will be cheaper for me to do 4" now. I dunno. Soon I am going to actually make some calls and price things.

Shrom CVX-18 · « **Reply #10 on:** February 07, 2011, 08:51:42 PM »

I did have the old "log style manifolds" and upgraded to these center risers. They just happen to be 4 inch. And I found exhaust tips on Craigslist for cheap that were never used. Right now everything is kinda falling together, the "S" pipe kit (Which is 4 inch)I was able to get used so that was cheap also. Thanks to OrangeFever.

Changing over to the new style manifolds I had to buy a new style alternator bracket and re-locate a couple things that were mounted on the old manifold but nothing major. I'm not sure that there is any reason why to go with 4 inch over 3 inch besides it being a deeper sound.

CVX Fever · « **Reply #11 on:** February 08, 2011, 09:12:52 AM »

Shrom the dry-fit manifolds came out in 2002. The way the cooling water flows from the manifold into the riser was changed. I suspect one advantage is a better/more durable gasket seal between the manifold and riser. But I'm not sure. I was hoping maybe you knew!

Shrom CVX-18 · « **Reply #12 on:** February 08, 2011, 11:10:14 AM »

lol Yeah I had no clue. They came off a 03 stingray engine (at least that was written on the side of the manifolds) I got a pretty good deal an them so I cant complain either way. Maybe it will help proformane

doubtfull but one can wish lol I am looking in to getting a 4brrl intake and carb. but that can be done with the engine in the boat, so i am in no hurry to do that right now.

AndyBean · « **Reply #13 on:** February 08, 2011, 06:31:59 PM »

Check out GT-jeff's post. He did this a couple months back to his CVX-18.

Shrom CVX-18 · « **Reply #14 on:** February 08, 2011, 07:23:57 PM »

Quote from: AndyBean on February 08, 2011, 06:31:59 PM

Check out GT-jeff's post. He did this a couple months back to his CVX-18.

Yeah I have acually talked with him through email. He gave me his basic list of steps that he did for his boat. Sounds like it all worked out great for him and went well. Seeing his deff motivated me to get started on mine.

Rosscoe · « **Reply #15 on:** February 12, 2011, 09:47:14 AM »

Are your new manifolds plumbed the same as the old ones in terms of what line is in and out? Maybe it doesnt matter? My old original log style had both the in and out the hoses on the front and I beleive merc cruiser style have one dropping out the bottom? I really dont know if the direction of flow matters or not. I'll be dealing with that this spring.

GT150 JEFF · « **Reply #16 on:** February 13, 2011, 07:11:57 AM »

Craig

How is the thru hull coming along?
Do you have the engine removed yet?
What manifold are you going to use for your intake?
A edelbrock performer RPM would be a good choice.

Jeff

Shrom CVX-18 · « **Reply #17 on:** February 13, 2011, 08:31:03 PM »

Quote from: Rosscoe on February 12, 2011, 09:47:14 AM

Are your new manifolds plumbed the same as the old ones in terms of what line is in and out? Maybe it doesnt matter? My old original log style had both the in and out the hoses on the front and I beleive merc cruiser style have one dropping out the bottom? I really dont know if the direction of flow matters or not. I'll be dealing with that this spring.

The new manifolds are plumbed about the same. They have one for on the risers and yes it did have only one out the bottom (center) on the manifolds themselves. I am plugging the center one, and using the two outer holes (that have plugs in them.) That will allow me to still have two hoses from the thermostat housing from the old setup. If I am correct the direction doesn't matter with the hoses that went to the manifolds, as long as you put the same hose that went to the old riser on to the new riser it should work fine. I will post pictures tomorrow of that setup. I will be getting new hose just because the old hose will not be long enough i do not think.

Shrom CVX-18 · « **Reply #18 on:** February 13, 2011, 08:47:26 PM »

Quote from: GT150 JEFF on February 13, 2011, 07:11:57 AM

Craig

How is the thru hull coming along?
Do you have the engine removed yet?
What manifold are you going to use for your intake?
A edelbrock performer RPM would be a good choice.

Jeff

Jeff,

I did get the engine out, While the engine is out I decided to go ahead and clean the bilge and put a couple coats of paint on it. Plus clean up all that wiring, and get it out of the clean engine compartment. The new manifold is just a stock GM that I was able to pick it up cheap. I also picked up and stock 4brrl 350 260hp carb for a price that I couldn't pass up. So I am looking to make that work. Steve is helping me out on possibly finding a cam setup to put in also, but sense I am not looking to not spend big bucks I will be nothing wild. Just enough to get me a little more stuff. The engine compartment is ready, now I am just waiting to get the engine back together and start again on the exhaust.

(the original project)

I had also installed new freeze plugs while it was out.

CVX Fever · « **Reply #19 on:** February 14, 2011, 11:40:15 AM »

Looking good Shrom! All you guys with your nice and clean, freshly painted, engine bays. I'm kinda surprised you didn't take out the rear seat to pull the motor. It is nice on these boats how everything can be removed fairly easy to open up the engine bay if need be.