Big Inlet and Exhaust Valves are Here (at last)
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Big Inlet and Exhaust Valves are Here (at last)
Yep,am just back from Cuba and have just been and collected a big box of valves from a neighbour who had kindly signed for them fom the courier.
I just tried to upload photos using photobucket to post here but the site seems to be undergoing maintenance. As soon as its back up I'll post the photos in this topic for you to see. It took me ages to lay them out all neatly to photograph. They do look the buisness though
I'll make enquiries with my bank to find out if there is a cheaper way for you to pay the balance other than paypal but I can't guarantee anything concrete at the moment. For those in the U.K., that have ordered, I'm quite happy to accept a cheque drawn on a U.K. bank but will obviously have to wait for it to clear before I post the valves.
I know it seems to have been a long while for all of this to get this far. Thankyou to everyone for their patience and faith. I hope it hasn't been too sorely tested.
I'm sure photobucket will be back up very soon. I hope so as it took me ages to make use of it's simplest features
Mark
I just tried to upload photos using photobucket to post here but the site seems to be undergoing maintenance. As soon as its back up I'll post the photos in this topic for you to see. It took me ages to lay them out all neatly to photograph. They do look the buisness though
I'll make enquiries with my bank to find out if there is a cheaper way for you to pay the balance other than paypal but I can't guarantee anything concrete at the moment. For those in the U.K., that have ordered, I'm quite happy to accept a cheque drawn on a U.K. bank but will obviously have to wait for it to clear before I post the valves.
I know it seems to have been a long while for all of this to get this far. Thankyou to everyone for their patience and faith. I hope it hasn't been too sorely tested.
I'm sure photobucket will be back up very soon. I hope so as it took me ages to make use of it's simplest features
Mark
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Re: Big Inlet and Exhaust Valves are Here (at last)
Ah, finally! It took aaaaages Just kidding, no worries mate.
Although I'm curious for the pictures, because I reckon you have about 100 valves now?
Now you have to pay attention, so you don't send like 10 exhaust valves to one person, and 10 middle-inlets to another person.
Although I'm curious for the pictures, because I reckon you have about 100 valves now?
Now you have to pay attention, so you don't send like 10 exhaust valves to one person, and 10 middle-inlets to another person.
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Re: Big Inlet and Exhaust Valves are Here (at last)
You're so right, I'm going to have measure and verify the length and diameter of every damn valve I send out so it might take a little time
Some of the new oversize valves
Five std valves (left) and five new oversize valves (right)
Std inlet v oversize (top) with std exhaust v oversize exhaust (below)
Sorry the last photo was blurry,the camera doesn't seem to want to focus . I'll try and bring my vernier caliper home from work tomorrow so I can show more clearly that the new valves are 1mm oversize. I never use it home,much prefer the feel and accuracy of a micrometer
If you'd like to pm me your delivery addresses, I can make a start on safely packaging up and addressing your valve sets for shipping off to you.
Mark
Ps. You should all have received my home address when I confimed your order.
Some of the new oversize valves
Five std valves (left) and five new oversize valves (right)
Std inlet v oversize (top) with std exhaust v oversize exhaust (below)
Sorry the last photo was blurry,the camera doesn't seem to want to focus . I'll try and bring my vernier caliper home from work tomorrow so I can show more clearly that the new valves are 1mm oversize. I never use it home,much prefer the feel and accuracy of a micrometer
If you'd like to pm me your delivery addresses, I can make a start on safely packaging up and addressing your valve sets for shipping off to you.
Mark
Ps. You should all have received my home address when I confimed your order.
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Re: Big Inlet and Exhaust Valves are Here (at last)
Std Valves compared to Big Valves sat in the cylinder head that I'm in the process of modifying. Big valves are still sitting high at the moment as I haven't cut the seats yet.
Mark
Mark
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Re: Big Inlet and Exhaust Valves are Here (at last)
The compression ratio will be up a bit with the flat surfaced valves - but do you think it will affect the swirl effect much?
1996 TRX 850, blue, Ohlins 46HRCLS, Race Tech Gold Valves, 0.90 springs, Venom pipes, R6 brakes............
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
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Re: Big Inlet and Exhaust Valves are Here (at last)
Just curious, IIRC the middle valve is another art number when ordering from OEM motorparts. These all look the same?
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Re: Big Inlet and Exhaust Valves are Here (at last)
The middle valve has a shorter stem. If I remember well, Sanddune mentioned this also earlier.Killerwhale wrote:Just curious, IIRC the middle valve is another art number when ordering from OEM motorparts. These all look the same?
Otherwise, we have a problem!
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Re: Big Inlet and Exhaust Valves are Here (at last)
Is the correct answer We have no problemsTarwetijger wrote:The middle valve has a shorter stem. If I remember well, Sanddune mentioned this also earlier.Killerwhale wrote:Just curious, IIRC the middle valve is another art number when ordering from OEM motorparts. These all look the same?
Otherwise, we have a problem!
Mark
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Re: Big Inlet and Exhaust Valves are Here (at last)
Swirl is primarily controlled by inlet port profile,bias and port bowl profile. Swirl can, in fact be measured. As I have absolutely zero facility to do this (in common with 99% of professional tuners),I'm unable to answer your question.I have never ever heard of valve face influencing swirl. 5 valve engines inherently have much less swirl than 2 valvers. We can only play with the cards we're dealt.dandywarhol wrote:The compression ratio will be up a bit with the flat surfaced valves - but do you think it will affect the swirl effect much?
The compression ratio will be as high as I can safely make it. If anyone has a bit going spare,can they let me have it please,I'm going to be hard pushed to find all I'll need . Only calculation,measurement,a couple of "dry builds",machining and some more measurements will give me the answers.
Mark.
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Re: Big Inlet and Exhaust Valves are Here (at last)
Just wondering as many manufacturers use piston bowl shape to increase swirl in the cylinder - the depression in the stock valve may be similar - I've really no idea
1996 TRX 850, blue, Ohlins 46HRCLS, Race Tech Gold Valves, 0.90 springs, Venom pipes, R6 brakes............
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
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Re: Big Inlet and Exhaust Valves are Here (at last)
question - does the TDM 900 share the same valves as the 850?
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Re: Big Inlet and Exhaust Valves are Here (at last)
Different last 2 numbers (ie *******- XX) s I recall,but yes they use the same valves.
Mark.
Mark.
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Re: Big Inlet and Exhaust Valves are Here (at last)
With these valves I have to alter the cilinderhead, so I will look into flowing the head now that I'm on it.
Another thing on my wishlist are different cams. And I think now is a good time.
I don't know which ones are still available. Any suggestions?
But I was wondering. If "race" cams use a higher lift than the standard ones, don't you risk that the bigger valves get slightly lower in the cilinders and hit the pistons??
Another thing on my wishlist are different cams. And I think now is a good time.
I don't know which ones are still available. Any suggestions?
But I was wondering. If "race" cams use a higher lift than the standard ones, don't you risk that the bigger valves get slightly lower in the cilinders and hit the pistons??
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Re: Big Inlet and Exhaust Valves are Here (at last)
The valves are closed when the pistons are at the top TarwetijgerTarwetijger wrote:With these valves I have to alter the cilinderhead, so I will look into flowing the head now that I'm on it.
Another thing on my wishlist are different cams. And I think now is a good time.
I don't know which ones are still available. Any suggestions?
But I was wondering. If "race" cams use a higher lift than the standard ones, don't you risk that the bigger valves get slightly lower in the cilinders and hit the pistons??
1996 TRX 850, blue, Ohlins 46HRCLS, Race Tech Gold Valves, 0.90 springs, Venom pipes, R6 brakes............
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
- Tarwetijger
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Re: Big Inlet and Exhaust Valves are Here (at last)
I know they should be, but are you sure there is no risk valves and piston getting close together?dandywarhol wrote: The valves are closed when the pistons are at the top Tarwetijger
Like not on TDC but on its way and very close to TDC?