Why do we not see many large displacement FI engines? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

BLACK10 · 04-24-2012, 10:34 PM

Big cubes and fi tend to have high coolant temps

Fiftydriver · 04-24-2012, 10:39 PM

Quote:

Originally Posted by RSBAD454

Here you go, 509 CI with Procharger.

that car is ugly as a mud duck but damn fast!!!

RSBAD454 · 04-24-2012, 10:52 PM

Quote:

Originally Posted by Fiftydriver

that car is ugly as a mud duck but damn fast!!!

Matter of opinion, I like it.

jrpxxii · 04-24-2012, 11:06 PM

The one thing I learned is that by going with an LSX427 and using an F1R that there was too much motor for the blower thus making the blower spin at max rpm and not producing enough boost. Since I decided to stay with my LSX427 I am now going with a larger blower to match the motor more efficiently. If I had to do it over I would follow Bruces route as its much easier to squeeze out higher boost.

Fiftydriver · 04-24-2012, 11:09 PM

Quote:

Originally Posted by RSBAD454

Matter of opinion, I like it.

Tell you what, it looks alot better after you see it run the 1/4 mile then it looks before you see it run

Fiftydriver · 04-24-2012, 11:10 PM

Quote:

Originally Posted by BLACK10

Big cubes and fi tend to have high coolant temps

That would make sense......

Starting to look like there are just easier ways to make big power is the reason.

Fiftydriver · 04-24-2012, 11:12 PM

Quote:

Originally Posted by jrpxxii

The one thing I learned is that by going with an LSX427 and using an F1R that there was too much motor for the blower thus making the blower spin at max rpm and not producing enough boost. Since I decided to stay with my LSX427 I am now going with a larger blower to match the motor more efficiently. If I had to do it over I would follow Bruces route as its much easier to squeeze out higher boost.

I would imagine that stepping up in blower size gets MUCH more expensive as well!!! The reasons are becoming clear why big displacements engines are not that common, at least not for FI set ups.

blackonblacksls · 04-24-2012, 11:40 PM

Bores over 4.155ish and strokes over 4in in a short deck build give up strength in the piston and head gasket sealing.

Go with a tall deck and you got some pretty serious forced induction motors in the 460ish range.

jay@redline-motorsports · 04-25-2012, 09:59 AM

if you go with a bigger motor then it will make more on motor and not have to spin the blower as hard to make a number, and if you run out of blower thats not a bad problem

just go turbo

speedster · 04-25-2012, 02:17 PM

Quote:

Originally Posted by Hendrix-Engineering

Wise choice ,when will it be on the track?

Trying to get it back for Pony Wars in May. It's gonna be close. Hope to see you there again. (Saw you at the last one in the fall)

Quote:

Originally Posted by Fiftydriver

So you started with a 454 and simply shortened the stroke to end up with a 388? Interesting!!! I have always wondered, for example, would a 388 combo with long stroke, small bore produce the same HP/Torque as a 388 combo with short stroke, large bore?????

I would think your set up would rev like wild and be hell for stout!!!

Kind of. We went through a bunch of power curves and simulations. For best overall 'driveability' meaning street manners and good HP, we ended up with the 388. It is basically a 4.125 bore with a stock length stroke, but with pro-mod bottom end parts. If we were shooting for 2,000 - 2,200 HP, it would have been a de-stroked RHS setup that was in the 440-450 ci range. The present shift point is 7200. That is with less cam duration. Open up the cam a little and the shift point climbs quickly but is not so streetable.

Quote:

Originally Posted by jrpxxii

The one thing I learned is that by going with an LSX427 and using an F1R that there was too much motor for the blower thus making the blower spin at max rpm and not producing enough boost. Since I decided to stay with my LSX427 I am now going with a larger blower to match the motor more efficiently. If I had to do it over I would follow Bruces route as its much easier to squeeze out higher boost.

J is dead on in that the bigger the motor, the bigger the blower. He now has both so LOOK OUT, because the power will be sick. Oh and a little nitrous to boot !

Quote:

Originally Posted by blackonblacksls

Bores over 4.155ish and strokes over 4in in a short deck build give up strength in the piston and head gasket sealing.

Go with a tall deck and you got some pretty serious forced induction motors in the 460ish range.

Yes, you get a lot of piston speed and sealing gets tougher with the FI.

Quote:

Originally Posted by jay@redline-motorsports

if you go with a bigger motor then it will make more on motor and not have to spin the blower as hard to make a number, and if you run out of blower thats not a bad problem

just go turbo

Big motors with blowers make sick street cars... The torque is usually ridiculous...

P.S. PM me sometime Jay, I have a question for you now that RedLine is in Florida. Thx !

motorhead · 04-25-2012, 02:23 PM

I think the biggest reason is that newer cars fit small motors betters. If you go to the drags, you'll see that people who are running old cars still use big blocks to go fast. Top fuel, funny car, and pro stock still all run big block based motors.

That 64 plymouth in my sig has a 440 that is stroked. Case in point. I would get laughed at if I had a small block in it.

04-24-2012, 11:06 PM	#18
jrpxxii Drives: 2010 Camaro SS/RS 427ci Join Date: Jul 2009 Location: Bowling Green, Ky Posts: 3,355	The one thing I learned is that by going with an LSX427 and using an F1R that there was too much motor for the blower thus making the blower spin at max rpm and not producing enough boost. Since I decided to stay with my LSX427 I am now going with a larger blower to match the motor more efficiently. If I had to do it over I would follow Bruces route as its much easier to squeeze out higher boost. __________________

04-24-2012, 10:34 PM	#15
BLACK10 Drives: 2010 CAMARO. 10.04@133mph, 1.4 60' Join Date: Jul 2009 Location: Lafayette, Louisiana Posts: 4,585	Big cubes and fi tend to have high coolant temps

04-24-2012, 11:40 PM	#22
blackonblacksls Drives: 2011 2ss/rs Join Date: Aug 2010 Location: houston Posts: 531	Bores over 4.155ish and strokes over 4in in a short deck build give up strength in the piston and head gasket sealing. Go with a tall deck and you got some pretty serious forced induction motors in the 460ish range.

04-25-2012, 09:59 AM	#23
jay@redline-motorsports Account Suspended Drives: 930 Join Date: Apr 2012 Location: fl Posts: 85	if you go with a bigger motor then it will make more on motor and not have to spin the blower as hard to make a number, and if you run out of blower thats not a bad problem just go turbo

04-25-2012, 02:23 PM	#25
motorhead Drives: Love the one you're with Join Date: Sep 2009 Location: Downtown Charlie Brown Posts: 11,849	I think the biggest reason is that newer cars fit small motors betters. If you go to the drags, you'll see that people who are running old cars still use big blocks to go fast. Top fuel, funny car, and pro stock still all run big block based motors. That 64 plymouth in my sig has a 440 that is stroked. Case in point. I would get laughed at if I had a small block in it.