raverx3m

iTrader: (1)

ive seen more and more people use and more demand for custom made parts which is great but now that got me a bit confused

how the hell do you make it all work together when you have 4 different shops making your custom parts?

custom header
custom cams
custom intake manifold
custom pistons etc

rich7777

You inform the next shop what custom part's you have and what your aim is?

koczeka

That is a good question!!!

We are all stupid and only try to get "custom" parts to work well together... results depends on luck (OK, experienced guys are guessing better), IMO they are generaly far from the real potential. Finding a real good combination takes a lot of R&D and money. That is a kind of work I can't imagine to be able to split and separate.

I am currently biulding a 84.5x92 using custom header, cams, pistons, intake manifold... and it should be strong... and it will be FAR from an optimal setup from an enginier point of view.

4piston

I think it bites a lot of guys in the *** who piece stuff together. There are engine builders, and there are engine assemblers. If you want a custom engine with more thought put into making more power and making it last longer, I'd hire a good engine shop to manage it and just tell them what you are after.

Everyone wants a unique and custom setup, but at an off the shelf price, and they want it yesterday

Aquafina

iTrader: (3)

The key to making it work is time and money. If you're not willing to rebuild the engine many times to try out different parts and retune it each time go with a cookie cutter setup. Building an engine to be unique on the internet (or real life) is pointless. Set a goal for yourself (place in class, or ET/MPH for fun) look at your budget, and go with the setup that will get you closest to your goal while staying within your budget. If you don't do it for a living, paying someone else (that is good) to build your engine will be cheaper in the long run.

raverx3m

iTrader: (1)

What i meant is where do you start?
Cams
Intake
Exhaust
Or displacement and compression?
Because each of the above technically needs to know the rest of the setup.

For example i use my future build.
85x87mm gsr motor high comp etc.

I ask for cams he needs to know the intake and exhaust manifolds used but those two are not made yet..
And same goes for the other two.

Aquafina

iTrader: (3)

Are you going to go with custom manifolds or OTS? As I said, figure out your goals and budget then go from there. 85x87 can be done cookie cutter so if you're not looking to be the fastest in the country with it I would go the cookie cutter route.

Kozy.

The correct method is to have everything specced before you spend a single dollar. You're not talking about building an engine, you're talking about designing one. That takes a whole load more skill and knowledge than most builders and tuners possess.

vtechjunkie

iTrader: (2)

It all depends on what I am building the motor for. OTS parts can build a 200+ whp pretty easily. But for any build, a goal makes for a much better end result. Just gives you a perspective of where the money will be best spent.

OH_1fstgsr

iTrader: (2)

Typically for a header you provide your engine specs to the header fabricator and they based off experience will make one. Look into SMSP or Myers Manifolds.

Cams, only flat out race car need full custom cams plus they are running VTEC killers. If you need a cam with unique primaries with a OTS VTEC it isn't really custom, you are just putting two different combinations together. Honestly why run custom cams, there are a ton of good options out there. In your 85x87 there a many cams will get you to 250whp.

I am running a custom intake manifold. Well sort of. Basically it is a GSR dual runner manifold with extensive modifications. I researched manifold designs for about 1.5 years before I had any work done on it. The butterfly valves are still in use. I did this for specific reasons, didn’t like the low end loses with the Performer X manifold on my car.
Your best bet would be a Victor X CnC'd or a Magnus manifold based off your engine size. You could also do a Kinsler Manifold, very very expensive.

Custom pistons, are you looking for something greater than 12.5:1? You should be able to find 85mm pistons around 12:1 or so.

Just my thoughts. Good luck on you build.

raverx3m

iTrader: (1)

oh yes that famous power goal advice

raverx3m

iTrader: (1)

its not really my engine specific. more of a general question i just used mine as an example.

bstadictd

Fall in love with engines (hondas), build a lot of them and begin to understand the limits of the parts then bam custom parts will be made. Very valid point to understand '' engine assembler vs builder''.

eDm cRxXx

You start off by having you head ported for your type of use (a fast spool turbo engine for rally use with a 30mm restrictor needs a different port than a NA dragrace car).

Then you order custom pistons based upon your new combustion chamber and what compression ratio you want.

Then you give you cam designer the flow chart, the compression ratio, the stroke, the diameter of the cylinder, and what else you may have).

They you give your header and intake designer the information on all of the above (type of use, cams, flow chart, CR, stroke, and so on).

At least that's my approach.

But the best approach is probably to use the same computer programs as car manufacturers, F1 teams (and so on) use. But you would need to know how to use them, and you would need to know a lot about thermo dynamics, fluid dynamics, sound waves, and so on.

raverx3m

iTrader: (1)

What programs are you talking about? Are any of them available for regular peoples? Or free ones?


Thats what i wanted to know thanks crx.

GhostAccord

Your probably not going to find those pieces of software for free.

There are some real good university texts on the above mentioned topics that you would have to familiarize yourself with before you would even understand the software and it's full capabilities.

Resonance tuning, thermo and fluid dynamics would be a good place to start.

Having a theoretical engine built before you actually build it helps. However, you still need R&D to finish it all off.

raverx3m

iTrader: (1)

lol yeaaaa im gonna have to get some degrees first

just want something better than off the shelf parts

if i spend 800 bucks on cams might as well get the ones that were made for my sepcific setup
and same for intake and exhaust manifold

GhostAccord

x2

Lots of research and study of how things work is required if you want to make it work! No easy way to piece together a custom build. OTS cookie cutters are a dime a dozen!

Aquafina

iTrader: (3)

Why? Is your current OTS cookie cutter setup not getting you to your goal, or is your goal just to have custom parts so you have say you have custom parts without knowing how much better than OTS they actually are?

raverx3m

iTrader: (1)

No its for different setup. Spent too much money on this one trying to be cheap without much return so im just leaving this one .
It was a good lesson tho. Doesnt mean that im gonna buy all the baller **** just cuz its expensive. I just have a better idea on where i can save a buck or two after this build.

Aquafina

iTrader: (3)

? Custom parts are more than OTS so how is that going to save you money?

You're not being very clear on why you want to go with custom parts other than you think if you're spending a lot of money that you might as well get custom parts (for no other reason than just because). Get in touch with any of the big engine builders and they'll probably tell you to go with OTS parts as it doesn't seem like you're building it to be top tier competitive (by the fact that its a B with only 85x87).

raverx3m

iTrader: (1)

only 85x87 is enough for me. im not competing i just want more power for my daily driver.
i like driving in general
why does it even matter, i want to get most power out of that engine and to me it looks like having those 3 parts custom made to work together is a good way to get some more power.

and no im not getting them just to be "custom" i dont even take the car to meets/shows. i drive it and i love driving it.
if you read my previous reply again, i didnt say that by buying custom parts i save money.

raverx3m

iTrader: (1)

just because im not building to be a top dawg at some drag race do you suggest that i just buy shitty parts then? since whats the point of building a good engine if you dont drag race or win a gold plated ball joint on a stand.

Aquafina

iTrader: (3)

The fact that you haven't done this before should steer you to OTS parts. You're likely going to end up spending more money on custom parts for not much of a change over OTS parts and you'll never know since you won't be doing back to back testing.

OTS parts are tried and true for cookie cutter setups (that you can do with this build) and are not "shitty parts." If you go with OTS parts and make great power I'm guessing you won't be driving around upset with yourself because you could have spent more money for possibly a few more whp.

I'm not picking at you, but having built both OTS cookie cutter setups lots of custom setups, the extra money and time (to do custom correctly, which will usually at least double your budget for the custom parts unless you just want a blind setup) is not worth it if you're not racing.

lsvda

first off i dont know how u got lesson out of that setup should have made atlest 10whp more than what it makes 2nd ur exhaust is killing ur motor 2.25 is to small put a 2.75 or 3in and 3rd put some OTS cams s2 pro1 with ur setup should make close to 220whp with a good tuner and beleive me u will be happy with ur current motor