Toyota V8 Exhaust Pipes Length/Size

[Litlos]

A friend in Australia has a streetrod I have worked on. Ford 302 has 4 in to 1 extractors with 3 or 4 inch collectors. There is a removable packing installed into the collectors which acts as a muffler, total length about 1.5 metres. He has a few different packing configurations he uses at various times. Basically the packing is a dish washer to fit inside the collector pipe with matt fibreglass type material supported internally by a stainless steel mesh, finishes of with another cup washer. Basically he has a variable internals straight through sports type muffler. Can be a bit loud on the road, but can be legal (one setup) in Australia which is home to the road nazi's for noise. However great sound and can adjust back pressure noise and very lightweight. The exhaust shown in pic 04 could have this type of packing installed easily.

Cheers

[Topcroc]

This is a great project I believe we are all enjoying. Some pix when you have time would be good. Glad you chose the 1UZ, from what I have been told the 2 UZ is not as strong.

[melvinmelvin]

The firing sequence is 1-8-4-3-6-5-7-2

when looking at the engine from the front; odd numbers on the RIGHT side, even numbers on the LEFT side

the cylinders are numbered from front to back

Bads news....this firing order is not tri-Y header friendly with optimum exhaust gas scavenging and keeping each bank of the V8 isolated.

Options:

1. You still could do a tri-Y for space savings pairing 1-5, 3-7, 6-8 and 4-2 cylinders for the primaries. This would create pulse intervals of 270 and 450 crankshaft degrees that might still produce good midrange power, but really with unknown results.

2. Really crazy exhaust header design with primary tubes crossing over the top of the engine and paired with the cylinder having the 360 crank degree exhaust pulse interval. I've seen this on race engines, it looks cool, but really don't recommend it.

3. Keep it simple, just do the 4-1 like other people have suggested. This would be my choice.

Cheers,

Chris

I intend to do this as simple as possible,

guess that I on each side pair the cylinder firing first and the one next to last

and then the cylinder firing as number 2 and the one firing last.

[Travelmate]

Why not use a motorbilke engine? Summat from a Hayabusa like.......

[EvilDrSomkid]

Why not use a motorbilke engine? Summat from a Hayabusa like.......

Revs are too high.

[melvinmelvin]

This is a great project I believe we are all enjoying. Some pix when you have time would be good. Glad you chose the 1UZ, from what I have been told the 2 UZ is not as strong.

can do that, the boat should be ready by end March (i.e. the boat as such, not with engine and longtail etc, that will take a couple of months I guess)

[melvinmelvin]

I cannot find any way of changing the title of this thread.

Could a mod please help?

Toyota V8 in Long-tail Boat

Would be a better title.

[melvinmelvin]

SCREWs

Over the past few weeks I have spent some time investigating where to buy/make different kind of screws.

Nearly all longtails use 2-bladed screws. However, I'd like to try 3-bladed with 13" or 14" pitch.

The boat guys in Nonthaburi laugh at me when I mention this. That's OK, but I am gonna try.

Funny thing though, none of these guys that have lived all their life with boats have the faintest idea about what screw pitch is.

Also, even those with relativeley high speed engines/boats, they haven't the foggiest about a cupped screw.

Strange, as they do love high speed.

I have visited 3 factories in/around BKK that produce screws.

In the first factory I was lucky and got talk to the owner. He definitely knew about cupped and pitch.

But alas, his factory is now specialising in making longtails and screws and shafts for small Honda engines only.

However, he agreed it would be worth trying a 3*13*13 or 3*13*14 cupped on a high speed soong dtoon.

The 2nd factory, in Samuth Prakan, was also interesting. I had a long chat with a very helpfull lady that definitely

knew about screws. (She hadn't heard about increasing pitch though, low near shaft and high at the end.)

However, they mostly make larger screws, up to about 1 meter in diameter.

The smallest she could make would be 3*14*17 cupped.

The last factory was in Dao Kanong. Typically a factory specialising in screws for all sorts of longtails.

They did have some 3 bladed screws and they did also have a few screws that were semi cupped.

Funny thing was they didn't have a clue about what pitch their screws were.

Not easy for me to understand how you can have a sizeable screw factory without knowing what pitch is.

Apparently customers pick their screws from the look.

Interesting.

[Crossy]

I cannot find any way of changing the title of this thread.

Could a mod please help?

Toyota V8 in Long-tail Boat

Would be a better title.

We try to avoid changing thread titles, I think it's to do with search engine issues. I have however changed the sub-title

[Topcroc]

In my days of inboard V8s, 2 blade props, cupped or not were used for racing boats.

In your case I would start off with a simple mid size three blade and then work from there.

You will have heaps of power. I would think the efficient rev range would be 35/4500 with short blasts to the limiter.

What size prop shaft?.

[melvinmelvin]

In my days of inboard V8s, 2 blade props, cupped or not were used for racing boats.

In your case I would start off with a simple mid size three blade and then work from there.

You will have heaps of power. I would think the efficient rev range would be 35/4500 with short blasts to the limiter.

What size prop shaft?.

haven't ordered the longtail yet, but I reckon 1" about

yes, guess about 4000 would be good, would be around the high torque rpm

need help from a local mechanic for ordering and installing longtail, engine fundament etc

will let him have his way initially, that is 2 blade about 13 or 14 inch diameter

the chap has a similar boat, he used to have a 1UZ in it but now he has a diesel plant

later I'd like to try 3*13*13 and 3*13*14

problem is that the factory in Dao Kanong that supplies loads of screws for longtails

has no idea what pitch their screws have

is there a reasonably simple way in which I can measure a screw's pitch?

[melvinmelvin]

RADIATOR/COOLER for water and oil.

Would anybody know a "factory" in BKK or surroundings that makes radiators and oil coolers?

I thought it would be easy to find shops with stacks of such, but it isn't.

I have found 2 shops that supplies brandname coolers for racing cars, somewhat pricey coolers.

I have only found 1 shop that specializes in radiators/coolers, but I was quoted rather ridiculous prices,

so would like to have a look at a "factory".

Easy enough, and quite cheap, to buy coolers as original spare parts for cars.

Thannon Worachak has lots of shops that supplies spare parts for all sorts of cars, but I wouldn't know anything about the size if I order in Worachak.

[mogandave]

Why not try Googleing Heat Exchanger Thailand

[mogandave]

Try this for the screw pitch

http://www.propellerpages.com/?c=articles&f=2006-03-27_manual_pitch_measurement

[Topcroc]

KIS-keep it simple. I feel you are trying to overcome perceived problems before you have tried a simple and basic set-up.

On previous posts we have discussed raw water cooling exiting through the exhaust. This is done by most V8 ski boats with no problems as long as you are operating in fresh water. I have a lexus with the engine you want to use, no engine oil cooling.

You will need a Jabsco raw water pump run off the engine via V belt, raw water strainer. Both very cheap inc a couple of rubber impellor spares.

Often raw water cooled ski boats have to have restrictions in the system so the engine reaches optimum operating temp.

I will be BKK next month, will pm you and maybe we can meet or at least phone. I may be able to bring a Jabsco pump and strainer with me.

[melvinmelvin]

Try this for the screw pitch

http://www.propeller...tch_measurement

thanks, great!

[melvinmelvin]

Why not try Googleing Heat Exchanger Thailand

thanks, have actually tried www, found some factories along Bang Na - Trat highway

which I visited, they only make HUGE radiators / heat exchangers for industrial purposes.

Edited February 18, 2012 by melvinmelvin

[melvinmelvin]

KIS-keep it simple. I feel you are trying to overcome perceived problems before you have tried a simple and basic set-up.

On previous posts we have discussed raw water cooling exiting through the exhaust. This is done by most V8 ski boats with no problems as long as you are operating in fresh water. I have a lexus with the engine you want to use, no engine oil cooling.

You will need a Jabsco raw water pump run off the engine via V belt, raw water strainer. Both very cheap inc a couple of rubber impellor spares.

Often raw water cooled ski boats have to have restrictions in the system so the engine reaches optimum operating temp.

I will be BKK next month, will pm you and maybe we can meet or at least phone. I may be able to bring a Jabsco pump and strainer with me.

thanks for that,

next month I'll be in Europe though

re cooling; my thinking is to have a closed system with cooling by means of fan/air/radiator,

rather than raw Chao Praya water through the engine.

the vast majority of longtails use Chao Praya though

however, I like the idea of water in the exhaust and want to try that to see how much it would help silence the engine noise

(its a pain installing mufflers in these boats)

my feeling is that a pump driven by the belts would deliver too much so I have been thinking of an electrical pump.

Its necessary to be able to switch the water flow on/off, or at least to be able to direct the flow away from the pipes

and directly overboard. When waiting for canal gates to open boats are "moored" very close together, and the chap

behind me in the queue would hardly appreciate being sprayed.

re Jabsco,

about a month ago I talked with the owner of Tritex Thailand,

its a marine equipment company with branches all over the world

they import a lot of marine equip. to Thailand

He said that he had completely stopped importing Jabsco because they have now moved their manufacturing to China

and the well known Jabsco quality has gone down the drain.

Dunno if that is the case, but thats what the chap said.

Edited February 18, 2012 by melvinmelvin

[melvinmelvin]

KIS-keep it simple. I feel you are trying to overcome perceived problems before you have tried a simple and basic set-up.

Agree, I certainly want to do this KIS.

Its more like I have never ever bought as much as a screw in Thailand before so I spend some time trying to find out

where to get hold of various issues.

Might not need an oil cooler. My Thai mechanic friend says not necessary. But in case I'd just like to know where to buy.

A Lexus engine lives its life in darkness, ie shadow, whilst in a longtail it will be exposed to rather strong sunshine all day.

[EvilDrSomkid]

Yes, but it will not be enclosed in an engine bay either. I think you will be fine without an oil cooler.

You are not running any turbos.

Agree on closed cooling system.

[Crossy]

At the risk of totally derailing this thread, you want the fastest boat on the Chao Praya? Have you considered adding foils and making a long-tail hydrofoil? Certainly different, and unlike hydroplanes, they are very stable and safe.

The Dragonfly gets up on its wings and flys at 20-25 mph on 9hp

imagine what you could do with your V8.

OK, I'll get my coat

[transam]

At the risk of totally derailing this thread, you want the fastest boat on the Chao Praya? Have you considered adding foils and making a long-tail hydrofoil? Certainly different, and unlike hydroplanes, they are very stable and safe.

The Dragonfly gets up on its wings and flys at 20-25 mph on 9hp

imagine what you could do with your V8.

OK, I'll get my coat

Hmmm, yes. V8 RULES.

[melvinmelvin]

555

good show! lol

another alternative would be an air-boat, have actually thought briefly of an air-boat

but the air draft would be a tad on the high side

[Crossy]

I did see a couple of air-boats during the flooding, they weren't operating (they were on a truck), but I'm also not convinced they would be the best vessel for flooded streets. They could be used to blow the relief packages to those in need.

[melvinmelvin]

I did see a couple of air-boats during the flooding, they weren't operating (they were on a truck), but I'm also not convinced they would be the best vessel for flooded streets. They could be used to blow the relief packages to those in need.

when you mentioned air-boats and truck I just remembered something I have seen

in Ranong,

along the main street there is a bar/restaurant named Sophon's Hideaway,

the chap from downunder running it actually has an air-kart,

go-kart like vehicle with the same arrangement as an air-boat

wonder how the BiBs appreciate such vehicles

[melvinmelvin]

The boats was finished early last week.

I was pretty pleased with the result. The paint job was very good, its an eye turner.

Yesterday morning I launched it in Chao Praya.

Am quite busy with some other things right now.

After Songkran I will start the effort re engine and longtail etc.

Expect that will take a month or two.

[mogandave]

No pics?

[melvinmelvin]

8.9 meter long and max beam is 1.54 meter

[transam]

8.9 meter long and max beam is 1.54 meter

I must say that is a cracking effort. Can't wait to see the V8 installed. Well done.

[melvinmelvin]

two things that make this an eye turner:

the boat's name itself

the paint job on the sides,

normally these boats are painted with lots and lots of different colours applied in various patterns

that is not very nice or elegant on rather small surfaces, the use of few colours on the relatively small surface of the side panels makes it look a lot nicer

haven't any pics of the boat after the launch

I should have taken a photo of the car that brought it to Chao Praya,

it was brought from Nakhon Pathom to Nonthaburi on the top of an ordinary pickup, it looked rather crazy