Compression & Ignition Question

Hi

Im rebuilding a 455 (#1241735). Setup is:

TA SE 1 ported 320 cfm/0.5 61ccm
EB Preformer Intake
TA 212 Cam
Forged Pistons
Q-Jet 750cfm from 69 400cui Engine
Ignition Stock

I want run with a 10.5:1 Compression and my issue is i dont know wich headgasket and pistons i need. I have no idea about this subject can anyone explain?
And are bigger jets required in the carb? I dont want to replace it with a bigger 800cfm. Because i have him previously rebuilded from cliff ruggles.
Next problem is the ignition. I dont know wich is the right uprade to run this setup. Hmm how many horse will bring these parts? what u guess?

Thanks

Robert

 

*bumped*

 

Robert you must know the deck height of the pistons, piston dish cc's and head chamber cc's to calculate a static CR.
Ray

 

If I had your combo I would run a points replacement and a quality coil I like Mallory.On your piston choice dish volume,deck height,headgasket thickness,& the cc of your chambers = your comp ratio.I shoot for a comp ratio but quench is a big factor for me.I would rather have a tight quench 10to1 than open 10.5.
I will use the Wiseco reverse dome piston again in my next build and deck the block to zero to 10 down the hole and shoot for 40 to 50 thou max quench.
Jamie

 

Sorry Ray I was yapping on the phone before I hit submit wasn't trying to repeat what you posted.
Jamie

 

Thanks for the replies. Now is the engine disassembled in the machine shop and i try to get all parts from TA. I hope i dont forget anything...

Best regards from switzerland

 

I would put a differnt cam in there too it will make better use of the ta heads maybe TA_288-92H

 

I have already bought the cam. A good idle like stock is required... Im not sure but the 288-92h cam is a bit aggressiv for my use... I hope i loss not much power with the 212

Here are pictures...

http://s303.photobucket.com/albums/nn153/JohnyBeeO/455 Rebuild/

 

that carburetor is going to require more than just a jet swap with your new engine. Get a hold of Cliff and get his advise on what to do. I'm sure he already did the big things when he rebuilt it for you so jets, rods and idle restrictions are likely all that need to be changed.

 

That cam is not real big, relatively speaking. So you don't want too high of static compression ratio. I would shoot for 10:1 maximum. The Federal-Mogul (Speed-Pro) L2353F is forged and should end up at 10:1 or slightly below.

 

Chamber cc's ?

 

61cc

 

Ahh I see in the 1st post. Never seen it written as ccm's before.
As was said that is a very small cam (265 adv/int/dur) for a high static compression ratio. Do you already have the heads?
Ray

 

Yes i have already the heads.

 

Would you be interested in a custom cam for about the same price as an off the shelf one?

 

I want a cam thats make torque and hp between 1000-5200 RPM and the TA 212 Cam make that. I know the heads are to good for this cam, but i need a Cam thats idle like Stock and the 288 series are a bit to hard in the idle. We have a road traffic licensing department and they dont accept power gains over 20% over stock. The engine must see and sounding like stock.

Would a 61cc a clearance issue? . The compressionrate is equal while the engine make enought power 450Hp or so..

 

So i have some issues to get the right compressionrate. I have found this on the web . I handle with these numbers:

Bore: 4.345" with .030" over
Stroke: 3.9"
Headgasket 0.040"
Deckheight: 0.02 <--- ???
Pistontopvolume: 27.8cc <-- with the L2353F ?
CC Heads: 61cc

Staticcompressionrate are 10.16:1 ?

Can everyone confirm that?

regards

Robert

 

*bump*

 

Bore 4.342" (.030"over)
Stroke 3.9"
gasket .040" (diam. 4.355")
Deck height .020"
Piston Dish 24cc (rated 27.8)
Heads 61cc

Static Comp 10.4995

 

Wow 20 percent over stock, Has to sound stock..........God I love it here in the USA.....Nice Ride tho

Chris