Finally Cosworth Heads!
#41
Sponsor
Forged Performance
Forged Performance
iTrader: (92)
Originally Posted by HeadGames
In my opinion yes. And most N/A heads also perform well under boosted applications. .
#44
Registered User
iTrader: (3)
Join Date: Jan 2006
Location: Panama, Central America
Posts: 965
Likes: 0
Received 2 Likes
on
1 Post
Originally Posted by rednezz
Congrats! Do you have cams already? Are you staying with the stock bottom end?
Any more ideas ?
Thanks
Danny
#45
Registered User
Thread Starter
iTrader: (1)
Join Date: Feb 2004
Location: Texas
Posts: 551
Likes: 0
Received 0 Likes
on
0 Posts
Found out these heads are 58 CC's. The stock VQ35 heads are 56 CC's. This will lower CR from 10.3 to approximately 10.
Stock CC's =
Swept: 583.0704
Total Chamber: 62.6957
With Cosworth Heads & stock bottom end.
Swept: 583.0704
Total Chamber: 64.6957
Stock CC's =
Swept: 583.0704
Total Chamber: 62.6957
With Cosworth Heads & stock bottom end.
Swept: 583.0704
Total Chamber: 64.6957
Last edited by rednezz; 06-15-2006 at 06:57 AM.
#47
Registered User
Join Date: Jun 2006
Location: All over!
Posts: 105
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by dscheers
Running the JWTs. Getting the Cosworth FI ones, once they are available. Building the engine with forged coated pistons and forged rods. ARP studs. Cosworth 3metal bearings. Anti-headlift mod. 14psi pulley on ATI Procharger but going for a higher redline, so I will get more boost. SnowPerformance Water-methanol injection.
Any more ideas ?
Thanks
Danny
Any more ideas ?
Thanks
Danny
-E
#48
Registered User
iTrader: (3)
Join Date: Jan 2006
Location: Panama, Central America
Posts: 965
Likes: 0
Received 2 Likes
on
1 Post
Originally Posted by HeadGames
if you milled them 14 thousandths you could get back the compression
Thanks
Danny
#49
Registered User
iTrader: (3)
Join Date: Jan 2006
Location: Panama, Central America
Posts: 965
Likes: 0
Received 2 Likes
on
1 Post
Just about now those 8.5:1 pistons I bought are starting to seem like a very bad choice and I'm kicking myself in the head for not going for the 9:1 ...
Danny
Danny
Originally Posted by rednezz
Found out these heads are 58 CC's. The stock VQ35 heads are 56 CC's. This will lower CR from 10.3 to approximately 10.
Stock CC's =
Swept: 583.0704
Total Chamber: 62.6957
With Cosworth Heads & stock bottom end.
Swept: 583.0704
Total Chamber: 64.6957
Stock CC's =
Swept: 583.0704
Total Chamber: 62.6957
With Cosworth Heads & stock bottom end.
Swept: 583.0704
Total Chamber: 64.6957
#51
Registered User
iTrader: (3)
Join Date: Jan 2006
Location: Panama, Central America
Posts: 965
Likes: 0
Received 2 Likes
on
1 Post
Originally Posted by HeadGames
you would be making the chamber smaller by milling it, your removing material not adding it. it's 5-7 for every CC
Help me out here, thanks
Danny
#52
Registered User
Join Date: Jun 2006
Location: All over!
Posts: 105
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by dscheers
The chamber is bigger so you have less compression. How would milling (making the chamber even bigger, right?) get you back the compression ?
Thanks
Danny
Thanks
Danny
This is a bit off topic, but how does boring to 100mm affect the compression ratios, since the chamber size (I'm guessing) doesn't change? I'm assuming this would raise the compression ratio in an otherwise stock engine to something like 11.1 or so...
And in a stock engine, to lower the compression to 9.0, you'd have to add 10.2 CCs or so to the combustion chamber with a dished piston, yea? And finally, 9.0 compression pistons with a Cosworth head on a 100mm block would be (if all my math isn't horribly wrong) 72.9 cc chambers with a 634 cc stroke, for a 9.7 compression ratio overall? Or am I misunderstanding the relationships here? I rounded all my numbers for the sake of simplicity, but you get the idea. Does boring change the chamber size to a significant extent?
Also, does increasing the size of the bore without changing the shape of the combustion chamber increase chances of having hotspots/detonation?
-E
#53
Registered User
Thread Starter
iTrader: (1)
Join Date: Feb 2004
Location: Texas
Posts: 551
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by dscheers
Just about now those 8.5:1 pistons I bought are starting to seem like a very bad choice and I'm kicking myself in the head for not going for the 9:1 ...
Danny
Danny
#55
Registered User
Join Date: Jun 2006
Location: All over!
Posts: 105
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by rednezz
Couldn't you run more boost?
-E
#56
New Member
iTrader: (18)
Originally Posted by dscheers
Just about now those 8.5:1 pistons I bought are starting to seem like a very bad choice and I'm kicking myself in the head for not going for the 9:1 ...
Danny
Danny
i keed, i keed!
#57
Registered User
iTrader: (3)
Join Date: Jan 2006
Location: Panama, Central America
Posts: 965
Likes: 0
Received 2 Likes
on
1 Post
Originally Posted by tig488
you should be kicking yourself in the head for going with the ati instead.
i keed, i keed!
i keed, i keed!
Well, I had my reasons (at that time). Temperature is always very high here, the choice of turbo kits was very limited at that time (APS refused to sell me a kit b/c of the lack of load bearing dynos in the country), ease of tuning and install, and at that point I wasn't going to build my engine. I should've know myself better...
Danny
If I had to make the decision over, I'd probably go TN ST
Last edited by dscheers; 06-15-2006 at 12:08 PM.
#59
Registered User
iTrader: (2)
Join Date: Jan 2003
Location: Australia
Posts: 1,647
Likes: 0
Received 0 Likes
on
0 Posts
Congrats Joe! You will love those beautiful heads!!! And with a set of 11.1:1 compression pistons and a set of wild cams (Nismo Spec 2 cans suit your needs), you should be at 320rwHP+!
cheers,
richie
cheers,
richie
#60
New Member
iTrader: (18)
Originally Posted by dscheers
No offense taken. (don't you just love this new rule )
Well, I had my reasons (at that time). Temperature is always very high here, the choice of turbo kits was very limited at that time (APS refused to sell me a kit b/c of the lack of load bearing dynos in the country), ease of tuning and install, and at that point I wasn't going to build my engine. I should've know myself better...
Danny
If I had to make the decision over, I'd probably go TN ST
Well, I had my reasons (at that time). Temperature is always very high here, the choice of turbo kits was very limited at that time (APS refused to sell me a kit b/c of the lack of load bearing dynos in the country), ease of tuning and install, and at that point I wasn't going to build my engine. I should've know myself better...
Danny
If I had to make the decision over, I'd probably go TN ST