Street motor chasing piston weight

Now i got the pistons down to 414 grams, and I will most likely have to reduce the dome to get quench clearance, so I´m close to the target 400 g, . It takes time to get those last grams, but there is no way around it when you are replacing pistons, and its more difficult when the assembly is initially balanced with extremely low reciprocating weight. Getting decent basic compression in a 4 3/4 stroke, 3 5/8 bore and bathtub type chambers is not doable with the typical 30 degree pistons,  but rather 43 degrees (dome) is required to get i.e 10, 5.

Street 96", Quench 3 5/8 Pistons

Ross Racing Pistons  made the Blanks which I¨m finishing,crown and Valve Pockets on, adjusting weight to target just below 400 grams, they came in at 542, but after Valve Pockets and the angled crown `got milled it´s down to 458 g.

Ross are super responsive and did meet my schedule and I was able to pick up on the east coast a couple of weeks ago, I sent my sketch dimensions from my CAD as pdf, and they work in Pro Engineer. I´m happy to get this motor back together with the right kind of quench pistons. I have been running some makeshift regular pistons. for a few years so it´s about time.

A.A.T.V. is Serviced

Picked up the "Acute Accelerator Transport Vehicle" from the extensive Service @ ABM, new head gaskets, studs replaced and heads milled, ABM is the "best damn garage" in this town. the 6,5 T.D. purrs again.

Early Spring

12 - 13 May is the date for Test &Tune at Kjula Dragway, and spring is here, feels like a month earlier than last year. My racing friends doing more extensive changes are feeling stressed... I´m servicing the street bike and in my tiny shop it´s hard to find space. Just waiting for some piston blanks from Ross, but I can put the lower end back in, so I´ll probably do what I can this upcoming weekend. It´s getting a short springer, 21" fr.wheel, new handle bars texas style and maybee a sexier hand shifter, and that´s about it. The really good news is that I have signed with my first serious sponsor for the racing operation.  B.N.Skorstensfolket are the ones making sure old chimneys are sealed up and leak free with a unique sealing method, I´m happy they volunteered to the good cause.

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Looking for Air..

At the end of my Zone week, been busy doing stuff that requires some focus, hence long nights alone. It´s been a while since a was in the "zone". had a one day visit to CHP (Calas High Performance) basically replacing bushings and straighten rods for the street motor,  but also to pick up inspiration. Servicing both the Street 96 " and "Mom". The Gearbox was ok, leakdown ok,  finished a sketch drawing for new pistons to the street motor which I mailed of to Ross Racing Pistons. Last season last race I logged low AFR at high speed, so I need to figure that somehow, so being low budget and not able to afford dyno time this year I have to work with what´s on the shelf. The other thing is that Dynos´doesnt simulate speed condition very well... The change we made before the last runs was that we did not port out the exhaust valve seats and I came out with a 10.16 run,  which is p.b. but with less top speed. So I had a pair of huge Velocity stacks laying around, and last night I milled out a raceworthy clamp. This is going to be interesting.