The V8 Owners Forum -

Thanks Chaps for all the good info

I alos need to make up a tensionor but i have the pullys so shouldend be to much of a problem

Has any one got any pics of a wade blower fitted to a rover v8? i would be nice to have a look at the belt tensionor and position

Many thanks
Derek

PS i will try and mock it all up this weekend if by bird will let me near it!

Not a wade but you can see a basic tensioner I made on my 4-71 blower in my build thread, mx5 in the garage scene section.

bigaldart wrote:Look for a Gates belt supplier in the uk. A lot of agricultural equipment uses the belts so there are suppliers scattered over the country. We use 8mm Taperlock pulleys as opposed to the typical american style aluminium ones. No problems at all with them, they locate with a key and use allen screws to secure. Swap one screw to another hole and it acts as a puller to break the taper. Very flexible and masses of sizes available.

Be careful with the wade though as they don't live long at higher rpm's On a road car aim for 5,500 maximum blower speed.

Alan

Hi all

Right a few more details.

The toth pitch is 8mm all 3 of the pullys i have are the same size. i was going to use one for the crank and the other to make up the tensonor

The engine is curentley 8.1-1 comp and is from a landrover 101 i now have 2 nice heads for a 3.9 so have the bigger valves and intend to fit to the 101 block

Not sure what compresion ratio i will end up with? also do you think i should be changing the crank pully or will a 1-1 drive boost to a sensable value 6-8 psi?

I alos have a nice blower cam and folowers rpi head studs and duplex chain set all ready to fit

Thanks again for all the good info

Like i say i am a bit new to blowing engines so any help is very welcome

Cheers
Derek

stagcar wrote:

bigaldart wrote:Look for a Gates belt supplier in the uk. A lot of agricultural equipment uses the belts so there are suppliers scattered over the country. We use 8mm Taperlock pulleys as opposed to the typical american style aluminium ones. No problems at all with them, they locate with a key and use allen screws to secure. Swap one screw to another hole and it acts as a puller to break the taper. Very flexible and masses of sizes available.

Be careful with the wade though as they don't live long at higher rpm's On a road car aim for 5,500 maximum blower speed.

Alan

Hi all

Right a few more details.

The toth pitch is 8mm all 3 of the pullys i have are the same size. i was going to use one for the crank and the other to make up the tensonor

The engine is curentley 8.1-1 comp and is from a landrover 101 i now have 2 nice heads for a 3.9 so have the bigger valves and intend to fit to the 101 block

Not sure what compresion ratio i will end up with? also do you think i should be changing the crank pully or will a 1-1 drive boost to a sensable value 6-8 psi?

I alos have a nice blower cam and folowers rpi head studs and duplex chain set all ready to fit

Thanks again for all the good info

Like i say i am a bit new to blowing engines so any help is very welcome

Cheers
Derek

Hi,

I have been looking in to this a bit more can any one say what boost i would be be getting if i ran the blower with a 1 to 1 drive?


i am looking to get around the 6 - 8 psi mark to be safe! i hope..

Many thanks
Derek

Hi there,

Wade RO34 is 3400cc's per rev, so on a 3.5 engine you have 1764 cc's swept volume per rev. 3400 / 1764 = 1.93 absolute so approx 0.93 bar boost, ie 14.7 x 0.93 = 13.67 lbs boost. Thats your 1-1 figure.

You require 8 lbs so 8 / 14.7 = .5442. Or 1.5442 absolute.

1.5442 / 1.93 = 80 % so for 8lbs you would need 20% underdrive.
ie. 20% more teeth on the blower pulley compared to the crankshaft. Not bad will let you rev to 6,500 and keep the blower speed sensible.
All this assuming no pumping losses, because real life doesn't work that way you will probably end up with 6-7 lbs of boost.

Hope this helps.

Alan

bigaldart wrote:Hi there,

Wade RO34 is 3400cc's per rev, so on a 3.5 engine you have 1764 cc's swept volume per rev. 3400 / 1764 = 1.93 absolute so approx 0.93 bar boost, ie 14.7 x 0.93 = 13.67 lbs boost. Thats your 1-1 figure.

You require 8 lbs so 8 / 14.7 = .5442. Or 1.5442 absolute.

1.5442 / 1.93 = 80 % so for 8lbs you would need 20% underdrive.
ie. 20% more teeth on the blower pulley compared to the crankshaft. Not bad will let you rev to 6,500 and keep the blower speed sensible.
All this assuming no pumping losses, because real life doesn't work that way you will probably end up with 6-7 lbs of boost.

Hope this helps.

Alan

Wow thanks for that good to see somebody has a clue what they are doing i don't lol

do you think i am heading the right way regards boost or should i be aiming higher?

I also have found some info stating that you shouldent run the blower over about 5500 rpm so in keeping with this the 20% so it should at 6500rpm engine speed not drive the blower over 5200rpm so nice and safe not sure if i would be able to boost more any way?




Thanks again
Derek

Start off with a safe amount of boost, best off to have some fun with low boost first and then experiment.

topcatproduction wrote:Start off with a safe amount of boost, best off to have some fun with low boost first and then experiment.

Your right mate i dont want to blow the thing to bits first go!

any way working on the 20% reduction i recon i need a 54 toth puley to go with the 45 that i already have and put the big one on the blower!

should be fun hunting that out!

Cheers
Derek

Pulley sizes sound spot on, you will be amazed how much livelier it is with conservative boost, it will put a grin on your face for sure. Wade RO34 is rated at 6000 maximum rpm and 5,500 for continuous use. At higher revs the rotors flex and cause all sorts of problems, bear in mind thay are designed with only 4 thou clearance internally, over the rotor length that isn't a lot of flex to get contact. The 4-71 GMC is a little bigger in swept volume but a lot stiffer internally, rotors are much more massive and helical. Clearance is usually a little higher and the gears have zero backlash, this allows for 13000+ rotor speeds.

Alan

bigaldart wrote:Pulley sizes sound spot on, you will be amazed how much livelier it is with conservative boost, it will put a grin on your face for sure. Wade RO34 is rated at 6000 maximum rpm and 5,500 for continuous use. At higher revs the rotors flex and cause all sorts of problems, bear in mind thay are designed with only 4 thou clearance internally, over the rotor length that isn't a lot of flex to get contact. The 4-71 GMC is a little bigger in swept volume but a lot stiffer internally, rotors are much more massive and helical. Clearance is usually a little higher and the gears have zero backlash, this allows for 13000+ rotor speeds.

Alan

Great stuff thanks for the explanation to i was wondering why you could not rev them to hell and back lol

1300 rpm is just mad bet it makes a nice noise tho.


Thanks for the confermation of pulley sizes i will drop a line to kev the mole and see what he can do for me

TBH just having the blower sticking out the bonnet will put a very big smile on my face

Cheers
Derek

O yes one other thing

I have a holley 390 vac secondary is this going to be any good or should i look to upgrade it?

Thanks again
Derek

When we ran a carb we had no problems running an 850 Holley, although on a race car, it idled and pottered around like a stocker. The less restrictive the intake the more boost the blower will make at any given speed. All that said though lots of people have run 390 Holleys on the street with no problems. Myself I would probably put a 600 on it for street use, lets be honest with a roots blower a couple of tenths of a mile per gallon extra is neither here nor there. The 390 will work just fine for now, you may need a double pumper just for the extra accelerator pump shot, you need to accelerate the blower as well as the crank pistons and rods. It all takes fuel.

Alan

bigaldart wrote:When we ran a carb we had no problems running an 850 Holley, although on a race car, it idled and pottered around like a stocker. The less restrictive the intake the more boost the blower will make at any given speed. All that said though lots of people have run 390 Holleys on the street with no problems. Myself I would probably put a 600 on it for street use, lets be honest with a roots blower a couple of tenths of a mile per gallon extra is neither here nor there. The 390 will work just fine for now, you may need a double pumper just for the extra accelerator pump shot, you need to accelerate the blower as well as the crank pistons and rods. It all takes fuel.

Alan

Nice on cheers Alan

Good to here i can use the 390 seeing as i have just trick kitted it.

Thanks for your help

Cheers
Derek

stagcar wrote:Thanks Chaps for all the good info

I alos need to make up a tensionor but i have the pullys so shouldend be to much of a problem

Has any one got any pics of a wade blower fitted to a rover v8? i would be nice to have a look at the belt tensionor and position

Many thanks
Derek

PS i will try and mock it all up this weekend if by bird will let me near it!

I screen grabbed these from an old home movie so forgive the quality !





Car is long gone now, also this is a scan from an old photo.



May be of some help ?

regards

Mark

That looks very nice mate

it looks like most of the tenshioners ar mounted on a clap arangement around the blowers snout

I may well do somthing similar then

Thanks for posting up the pic's looks the muts nuts

What car was it?

Cheers
Derek