ZROSSA
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Posts posted by ZROSSA
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Scott,
I think the guys here have already covered most of it and for that matter are far better qualified than I to answer the question. The main thing with a single plane is lack of low rpm torque. This seems to be from lack of high speed airflow to properly mix the fuel and air together. Fuel injection doesnt need high manifold airflow to do this becuase its done with fuel pressure so it tends to pick up the low rpm torque. In saying all this a lot of the guys are runing big carbs and single plan manifolds and not having problems due to the low weight of the z.
I hope this was some help and not misleading in any way, I am new to V8's and have always played with revy little fours in light cars in the past.
Cheers
Douglas
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z-tard,
it the current shape supras that have the 6 speed. I dont know if the bell housing it the same as the five speed one. The five speed was what there are kit out there for. If they are the same let me know. I would like a six speed for the z.
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Omar,
I have seen decompression plates on turbo engines and these have head gaskets on both sides. I wouldnt be stacking gaskets myself.
Douglas
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Good on ya Robzilla,
How good a bend can you get? Can they be made as good as mandrel bends? This could make getting equal length header much easier.
Cheers
Douglas
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Got of my fat but and had a look under the z. the pipe could go forward of the sump but this seams to defeat the purpose somewhat, there is room to do it behind the sump as well. Little as it may be, I hate to add weight to the front of the car, so I will try to get them behind the sump. I cant be bothered , however, it it wont get me more power. Any one know if it will or not?
Cheers
Douglas
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I may be way of the wall here but I had a conversation with a old employee of mine years ago who said he made motor bike headers buy getting the length he wanted and then sealed the ends after filling them with sand, then heated and bent them to the shape he wanted. It seems remotely possable if you took great care in the bending process to not crimp the tubes. i wonder how the F1 and Indy guys make there headers? Thre doesnt seem to be any joins.
Douglas
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Howdy Yall,
I was flicking throught he holley site the other day and saw that the the 600 to 850 carb all came from the same family. 4150 and 4160. Does this mean that i could change my 600 vac sec to a 750 without buying a new carb. Its probable cheeper to just get a new one but i am just curious.
Douglas
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You fab your own engine mounts. Kind of like the set back plates in reverse. I can take a digital photo if you like, but i would have to e-mail it. to someone to post. Let me know.
Douglas
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Good on you. it will be wicked. Try a 21r toyota piston. From memory its around 91mm and has a hemi head as well. Are you trying to get it out to around 6 ltrs?
Douglas
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Scott,
If you are going to run injection then a lot of the problems assocatiated with single plane manifolds can be tuned out. You dont have to worry about low air flow not sending the right signal to the carb. The victor jr seem to be a favoured manifold, however i wonder if you can get away with something more like a tunnel ram becuase of the advantages of fuel injection. Any one else know?
Douglas
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Pete,
I see where you are coming from but i dont know if it would work. I have a book buy a guy called A. Graham Bell called "4 stroke performance tuning". this is my bible but its buried in storage while my house is being built. He goes into what you are saying a little so i will check it out when i can. The chev i have has small block huggers on it that need to come out for a bit of work any way. I was thinking that i would cut them of before the collecters and run the middle pipes under. I am looking for a tube lenth around 36 inches if i can. I havent climbed under the car for a while so i forget how it layed. Also i am running a supra 5 speed which is nice and small so there may be room further back. We will see.
Cheers
Douglas
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What about a set up with 3 small holleys or mabye 6 two barrel ones.
Someone must have done this buy now. Webers are two damn expensive. Which brings me on to the next subject. Has anyone seen a 4* 2 barrel holley setup for the domestic v8?Douglas
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Got to agree with you there Omar. Dont know much about the differnt properties but i do know that my all. mountain bike is a hell of a lot stiffer then a steel one for a tiny bit less weight. You might have to fab the mounts so that there is extra metal where you get bending loads.
Let us know how you get on.
Douglas
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Me
in Site Support
As I said before, let me know if i can help. I think that Pete is on the same track that i am in that we go through the old posts and sift through the relevant inf. It would be way cool if we could link the inf. to members sites that have done that mod. for a more detailed look and inf. Might save on "band width" as well, not that i know what that means.
Good thing about this part of the world is that i get to have beer way before your Friday has even started!
Douglas
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Toyota makes a v12 5.0 48 valve in there domestic market. Its pretty hard to find inf. on it though. It is in there domestic market CENTURY a barge if there every was one. Power is capped at the jap standard max. of around 280 hp.
Douglas
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Howdy,
I am back on this 180 degree header thing again. I think i can make some buy converting the existing block hugers and making flanges to get it in and out. Does anyone know if they will actually make more power. There is little on the web about them but they seem to be baned in a lot of circle tracks so there must be something in that. I love the sound the make and it would also make people scratch there head when i blow there doors off.
Why dont he drag guys use them?
Douglas
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There is stuff out there for the v12. The poms are getting them out to 8.2 lts with over bores and stroking. The price is out of this world though. There is also weber manifolds and individual runer feul injection set ups. Mabye do a search for tom walkinshaw racing. He raced with these engines at le mans. Bob tullis also raced this engine in scca.
Douglas
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Thanks guys, the other things on the casting that i remember was "conv4" and "gm17". I will have another look and check out the other head for more inf.
Douglas
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Thanks guys.
You always come through with the goods. I have vizards head book and hopefully will start to read it tonight if the baby goes to sleep. I am looking for around 400 hp and it loks like everything is in order on the z i bought to do so. Just needs a bit of exhaust work and tuning and we will be burning up the road.
Douglas
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Guys, When you talk About heads and say for instance "195 airflow research heads", does the 195 stand for intake flow or intake volume?
If its intake volume then It really wouldnt have much relevance to the power making capabilities of those heads whold it?
Thanks,Douglas
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Allrighty then. I have looked again and i thought that the number was 8847041. those first two numbers are hard to read though and it could very well be a 3 or a 9. I think that there lies my answer.
Thank YALL for your help.
Douglas
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Thanks Terry
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The casting number is 8647041.
Vizard says the 041 casting is from 69 70 high po motors but the whole casting number he has in the book was different. Can anyone out there advise if these heads are any good. They have 2.02/1.6 valves and have been ported. The previous owner decribed them as "fuelie spec". I am making a to do list and would like to know if these will make the 400 odd hp i am looking for?
Thanks,
Douglas
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Howdy all,
I unburied the z this afternoon and was generally stuffing about and making a to do list. The carb is a 650 vac sec holley with manual choke. I was looking for part numbers so i could get a rebuild kit for it. There are heaps of numbers on the front of the carb that looks like the genitic code for the humpback whale. Is this what i use or are all the carbs the same?
thanks,
Douglas
Thanks,
Front end pressure profile
in Miscellaneous Tech
Posted
Hey guys,
I know this is old but, did you get anymore inf. It seems to my misguided mind that if there was a vacume on the front on the bonnet then thats where you would want to run vents. It would suck the air out.
Cheers
Douglas