117 tc heads as cast

dynoharley
7 years ago

117 bike kit , heads are 110 as cast , these heads have seat id opened up to much in factory , on flow bench it shows low lift loses , moved seats from 2.080 valve to out to suit 2.100 inlet valve , tried best to get 4 angle on seat with same id in seat still as it was over size already ,2 angle on valve face 2 charts of flow , before and after figures , , these heads basically only have 2 angle and internal diameter of insert cut way over percentage , few picks of seats before and after , all so 1 inlet valve slightly bent ,

dynoharley
7 years ago

fitting .600 lift cams to theses heads , the orig springs only handle .580 lift with nothing to spare of coil bind so haveing to fit up grades springs , also the original valve stem seals are rubbish , vitron being fitted

Krash Kinkade
7 years ago

Good stuff DH!!
was this with manifold fitted? or just port?

dynoharley
7 years ago

manifold fitted , I also flowed with all componets on head also crash ,tb air cleaner , these are figures

Krash Kinkade
7 years ago

That's great D!! HD have been improving heaps with there heads so good to see. as in past you had big inch with heads that flowed about same as old 80" EVO so made bulk TQ but not a lot of HP.

dynoharley
7 years ago

that's cool , the other day I did some early tc haeds , fitted 1.940 inlets , then ran with mikini manifold , then flowed with 42 mikini on as well , then refomed with s/s g etc for comaparsion

Krash Kinkade
7 years ago

dh what size intake valves in the 117 SE heads? & what size TB?
years ago with an old SF flow bench m8 flowed a mik 42 on manifold and a cv40 on same manifold & they flowed same air. i have a lot of old harley carb's as i've been stuffing around with Harleys & drag racing them at street level since late 70's. i got a Woods Rebel 43.5 carb from a friend in states we put it on flow bench on a S&S G manifold then got an S&S G flowed that & both flowed same air. but this type info would not interest the modern EFI crew just saying while on flow chat. this is good for the real truth too. as can show people max flow of heads and just putting a huge TB won't change things. but still a lot more to it as you find out if you flow test, then dyno then go to the black Dyno. the black dyno is the hard part but i love it!. good to see someone that puts $ in to there work shop to do it all in house and also goes to the track & rides too.!!

dynoharley
7 years ago

You can only get so much flow from a given valve size , so bigger any thing in front of it will still stop st same point crash , love to try the woods carbys on bench , be interesting ,when we increase a engine cubic inch , if every thing else doesn't go up in size with it then , dsme corks still controlling overall figures , stuck with same inlet ring size , that controls the CSA of the port , do there is one point most people dont see or think about krash , that's why they won't carry up higher in the rpm , and port shape location , shape ,design Dont favour it

Krash Kinkade
7 years ago

I got the Wood carb on my buell, in its day a good carb, he had to buy new CV44's to make the rebel 43.5 he machined out venturi, he has also re sized the air bleed, thats why people get a shock the intermediate jet sizes also it runs holley main jets so can go up in one thou increments few other tricks he has used. it is beautiful no flat spots and just goes when you open it under load also good fuel economy on runs.
Those heads flowing a lot of air @ 300 lift

dynoharley
7 years ago

The theory behind cutting 4 angle on seat and 2 on valve and keep.I'd of seat to correct % is to create a venturi effect to aid low lifts in flow krash ,