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Viktor air gap intake

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Dave De
68galaxie
FalconEh
jeffgfg
gmsmkr
nord315
DanE
69F100
rmcomprandy
jbozzelle
Bart Knox
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Post  jeffgfg December 2nd 2015, 5:05 pm

You can't use domed pistons with Dove heads unless you want 13-15 to 1 compression. You need DISHED pistons to get the compression you want. The pistons you listed from ebay were for 92 cc heads with 10.7 to compression. Hope this helps.

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Post  Bart Knox December 2nd 2015, 8:36 pm

I've been on the phone will summit racing tecnical support and found some pistons and rockers that I can afford and the pistons come in standard size.I talked to the guy I've been buying parts from on the internet he seems to think there all right. Keith Black dish pistons part number kb206 ktm-std and scorpion rockers. The pistons will put me from 9.9-1 to about 10.2-1 depending on exact cc of expansion chambers let me know if anyone thinks that this is the wrong way to go. I can afford them now and I'll pretty much have everything I need to drop the motor off and get it put together
Bart Knox
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Post  DanE December 2nd 2015, 9:23 pm

My 2 stroke snowmobiles have expansion chambers for part of the exhaust system.

Most automobile cylinder heads have combustion chambers. Smile

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Post  Bart Knox December 2nd 2015, 10:08 pm

Sorry t9 is turned on because I can't spell worth
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Post  Bart Knox December 2nd 2015, 10:10 pm

Combustion chamber Combustion combustion
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Post  FalconEh December 2nd 2015, 10:12 pm

Bart Knox wrote:I went to talk to an engine builder last night and he said he would help me out. Told me to get stright up timing gear and chain and camshaft. Then if I can afford it after I get those peaces flat top pistons and heads. So I'm trying to put some prices together and I'm going to go back over and see what he ses make sure all the parts work together. So I'll put 3 or 4 grand into the motor a cheap build and that should be good for my first motor

Bart Knox wrote:This guy is a Ford only nut worked at the dealership in town for years now has his own shop and has done more than one 460. For hands on help he's definitely the best help I can get around here. I'm going to keep this thread going so I can talk to you guys step by step. Putting together a couple thousand dollars to get started.

Bart Knox wrote:Pistons are on ebay speed pro L2443NF dome+30 ....400" if anyone wants to check them out.if probe makes a similar piston better quality or someone has a better cheap piston they know of let me know

Bart Knox wrote:I've been on the phone will summit racing tecnical support and found some pistons and rockers that I can afford and the pistons come in standard size.I talked to the guy I've been buying parts from on the internet he seems to think there all right. Keith Black dish pistons part number kb206 ktm-std and scorpion rockers. The pistons will put me from 9.9-1 to about 10.2-1 depending on exact cc of expansion chambers let me know if anyone thinks that this is the wrong way to go. I can afford them now and I'll pretty much have everything I need to drop the motor off and get it put together


A few things, you mention you talked to an engine builder, you mention he has a shop and he is going to put it together, is he an engine builder or is he doing an engine assembly for you, in other words is there machine work being done? If he is an engine builder and there is (hopefully) machine work being done, why wouldn't you tell your engine builder what you want for compression, performance etc. and let him help you choose the pistons after the machining is performed and you know the required/desired over bore. I also believe you have listed a +.030 piston and a std bore piston which leads me to believe you have the cart before the horse. Suspect
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Post  Bart Knox December 2nd 2015, 10:32 pm

This guy worked at the ford dealership for a few years and has a shop they do mostly diesel engine work but he is a ford only guy and is going to do this for me for a favor pretty much$500 I'm not loaded with money and he steers me in a detection for what to look for I guess if I had ten or fifteen grand I would just drop it off and tell him to go nuts. He has bilt some motors for mbrp performance exghust but ya this is pretty much just a assembly some porting on the heads and standard pistons if the cylinders are not wore to much I live in the north I would have to drive to the city to have the cylinders bored I don't have anyone I can talk to in person about what to buy I've just been spending a bit of every paycheck until I have everything
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Post  FalconEh December 3rd 2015, 11:17 pm

Bart Knox wrote:This guy worked at the ford dealership for a few years and has a shop they do mostly diesel engine work but he is a ford only guy and is going to do this for me for a favor pretty much$500 I'm not loaded with money and he steers me in a detection for what to look for I guess if I had ten or fifteen grand I would just drop it off and tell him to go nuts. He has bilt some motors for mbrp performance exghust but ya this is pretty much just a assembly some porting on the heads and standard pistons if the cylinders are not wore to much I live in the north I would have to drive to the city to have the cylinders bored I don't have anyone I can talk to in person about what to buy I've just been spending a bit of every paycheck until I have everything

You may want to hold off on the porting & pistons until you check the cylinders and find out whether they will clean up at std bore, if not you need to find another block that will, in order to use the std pistons if you buy them, the porting will be useless if everything is blowing by the rings, or the rings fail. You don't need to spend 10-15 grand you just need to spend what you have at the right time in the most important places.
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Post  Bart Knox December 4th 2015, 9:18 am

I wasn't going to order the pistons till I now if I have to bore the block or not just seeing if I should get these ones or if someone knows of some other pistons that also come in standard size or 30 over that will give me close to11-1 compression. Im learning as I go and trying not to bug this guy on every peace that I look at.
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Post  Bart Knox December 6th 2015, 7:37 pm

What would I end up with for compression if I used 87-92 7cc dish stock pistons? I read a few threads about dove-c heads on efi block seen these pistons on ebay cheap.
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Post  Bart Knox December 14th 2015, 7:19 pm

Found someone else to do the rebuild he runs a machine shop and is doing a 460 right now dropping motor off in the morning with$1500 he's going to get the pistons and what ever else I'm going to need. Going with speed pro pistons L2404F dish pistons and scorpion roller rockers if anyone has any last minute suggestions would appreciate it thanks
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Post  rmcomprandy December 14th 2015, 9:32 pm

Bart Knox wrote:Found someone else to do the rebuild he runs a machine shop and is doing a 460 right now dropping motor off in the morning with$1500 he's going to get the pistons and what ever else I'm going to need. Going with speed pro pistons L2404F dish pistons and scorpion roller rockers if anyone has any last minute suggestions would appreciate it thanks

You have disregarded or changed most of the suggestions from here so, you may as well just stay on that track ... scratch

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Post  Bart Knox December 14th 2015, 9:56 pm

Guess I'll see how it goes has to be better than what I have now I got rid of the victor intake and got a bigger carb witch was suggested the speed pro pistons seem to be close to the same cc dish as the probe pistons you suggested just cheaper already had alot of the stuff like heads that I was told not to bother using I am taking it to a machine shop not just having it assembled like someone suggested.
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Post  68galaxie December 15th 2015, 11:58 am

rmcomprandy wrote:
You have disregarded or changed most of the suggestions from here so, you may as well just stay on that track ... scratch

Very true RM.

The issue with all public forums is which is good advice and which is bad?
A new forum user has no idea "who is who" and which recommendation is a good one - or a bad one.
Even seasoned experts have differing opinions - best to find a reputable engine builder - not just a machine shop.

If you don't trust your engine builder, then find another one you do trust -

Good luck with your build!!

Cheers
68galaxie
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Post  DanE December 15th 2015, 12:06 pm

I hope you are going to have the block decked to the pistons.

What are you planning to use for an exhaust system?



It HAS been frustrating trying to get you on the right track Smile .

And if you thought you snapped u joints before ......................

I truly hope this project turns out OK.

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Post  Bart Knox December 15th 2015, 3:10 pm

Im leaving the motor up to this guy just got back from dropping it off and all the parts he told me to go with speed pro pistons not the ones that were suggested but will give me 10-1 with the dove-c heads. I talked to a guy that had two motors done by him and was happy. He's going to port the heads told me to stay with stock size valves have to talk to him again about decking the block. I'm going to do something with the axles probably just a drive shaft from high angle driveline unless I can drop the motor 4 inches I would probably be alright. so steep right now I have to run a single ujouint. What would I gane by decking the block in compression with those pistons that were suggested his book said 8.9-1 or something low
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Post  Bart Knox December 15th 2015, 3:41 pm

If someone explain the benefits of decking the block to me I can sound like I know what I'm talking about when I go back to talk to him he's going to call me in a few days
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Post  Bart Knox December 15th 2015, 5:21 pm

I've been reading up on benefits of decking and every thread turns into a argument about wether or not its worth doing
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Post  Bart Knox December 15th 2015, 6:17 pm

As far as exhaust I'm thinking strait up headers since I don't know what headers are going to work if I drop the motor. I was thinking block huggers but I don't want to order a set and not have them work so thought I can't screw up straight through the hood
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Post  DanE December 15th 2015, 6:29 pm

I just typed about a page explaining things front to rear and lost it somewhere between hitting the send button and it appearing in the thread. DAMN! later

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Post  Bart Knox December 15th 2015, 7:00 pm

The home button on my phone always seems to be beside the send button happens all the time
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Post  Bart Knox December 18th 2015, 9:45 pm

Buddy is ready to start putting my motor together tomorrow I'm going to go see him in the morning. He suggested against decking. If someone wants to explain about the benefits of I'll talk to him in the morning about it.
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Post  DanE December 19th 2015, 9:28 am

What you needed to do to have a successful build has already been posted. If your machinist thinks its not necessary to deck the block, how is he going to get the quench around .040"?

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Post  Bart Knox December 19th 2015, 3:53 pm

Said something about custom made pistons
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Post  rmcomprandy December 19th 2015, 4:31 pm

He probably knows about some custom made Speed-Pro pistons which nobody else has ever heard about... Rolling Eyes

Must have an "IN" somewhere.

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