|09-05-2010 02:06 PM|
The short block is all together. I will be ordering the cam soon hopefully and then I can degree the cam, put the timing cover on, and the oil pan.
For those of you who are observant you probably noticed that piston 1 appears to be in backwards due to the dot on the piston facing the back. It was for the even side but the only piston I had left. I had a pile of pistons from two different 305s. One came apart so most of it was junk. My machinist said the orientation on the pistons doesn't matter for that style heads just the rod orientation does which is correct.
|08-30-2010 10:31 AM|
|08-30-2010 09:16 AM|
|turbolover||be sure to get the incoming charge as cool as possible. heat soak is a problem with smaller turbos, but isn't a big deal if you cool down the charge.|
|08-30-2010 09:10 AM|
|zildjian4life218||Well I went to keith blacks website and used their calc for ring gap. I put the top ring at about .028" and the second ring at .030". The calc said .026" and .028" but i would rather things be on the loose side as opposed to the tight side.|
|08-19-2010 10:19 PM|
|zildjian4life218||Anyone any ideas on the ring gap? Stock bore 305. Gonna be running 12-15lbs|
|08-19-2010 10:08 AM|
|zildjian4life218||Any idea what I should gap the rings too. I got some enginetech El cheapo rings. Just putting some dished stock pistons back in it. I'm having a hard time believing this is gonna make over 400hp with the t25 turbos. Later ill build a 305 with the forged pistons I got and bigger turbos. I put the top ring in and its sitting at about .020. Thanks for all the help and support.|
|07-28-2010 09:32 PM|
|07-25-2010 10:42 PM|
Very, very goo grasshoppa....now I show you calcula5tor to do math for you :
Now that you understand the math you can plug things in to the above listed calculators and actually understand what you are seeing.
There are some points to consider. First, you are only calculating peak RPM. How much are you going to operate at full power? Second if you run those numbers again for the same boost numbers at 3500RPM and I think you will find that it is about perfect. How much time will you spend around this range? Third, the map does continue and if you continue the lines you can see it will be right at the edge, but will in fact still feed the engine sufficiently.
My point in all of this is if it is a street car, it will work very nicely and spool instantly which will make for a very fun ride.
I also dont disagree that they are a little bit small, but not much.....in the end it comes down to what you are wanting to do.
|07-24-2010 11:13 PM|
So I think I might go with some bigger turbos...........
Can someone with turbo knowledge or any knowledge that can help check my math. I bought a book titled "Street Turbocharging" by HP Books. In here is a step by step calculations for plotting turbo compressor maps.
Okay first off you figure out the specs of the engine
assuming 80% VE
IC Eff 60%
Figure out the Pressure Ratio of the compressor
(12+14.7)/14.7 = 1.816
Then the Pressure Ratio of the System assuming a 1 psi drop through the Intercooler
(12-1+14.7)/14.7 = 1.748
Now we figure out the temperature rise after the compressor assuming ideal
Toutideal = [(Tin+460)*PR^0.283]-460
Now we find the actual temperature assuming the efficiency of the turbocharger which is 72%.
Toutactual=[(185-85)/.072]+85 = 223.8*F
Now we find the temp of the air coming out of the Intercooler.
The Density Ratio is then figured out by
DR = 1.75*[(85+460)/(140.6+460)] = 1.5869
Then you figure out the VFR which is the volumetric flow rate at redline of the NA engine.
Last step is to find the Mass flow rate which is
MFR=(2.703*14.7*353*1.5869)/85+460 = 41 lb/min
Sorry its so long I want to make sure I have this somewhat right. Thanks! These turbos flow 15 lb/min at a PR of 1.82 so idk if they will quite cut it. I think I will be spinning them way too much and burn them up.
I attached a compressor map for the turbo I am using. The red dot shows where I would be sitting.
|07-14-2010 11:41 AM|
|07-14-2010 11:09 AM|
|07-14-2010 09:58 AM|
|07-13-2010 10:40 PM|
|TurboS10||Either they will fit or they will not. There is no room in between. You will need to know if they are high or low impedence as well.|
|07-13-2010 04:30 PM|
|zildjian4life218||I was talking the other day with some friends of mine that are big into turbo charging hondas. They said for injectors the can get a hold of 4 450cc injectors for $50 off of a DSM factory turbo car. Anyway these would work on my tpi intake? I used an online calc and found them to be 42 lb/hr which would be perfect for my build. I was wondering what I would have to worry about fitting properly. I know for the wiring connector I can just get the connectors from that car and splice them onto my harness. Not sure on the intake rail connection or where they go into the intake. Any one have any idea?|
|07-04-2010 08:24 AM|
Soon ill pull the turbo apart to clean it up. Just waiting for some time. I also have to go back to the yard to get another one.
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