My 406 Project.

Tech Related Discussion

Postby Daves406 » Tue Jul 28, 2009 8:15 pm

jmarkaudio wrote:As another note, why not bury the hatchet with Banjo and try making constructive comments and suggestions. We are all here to learn from each other and help each other.


Mark,, tried that road,, Banjo however questions the performance of my car and or the motor.. Which is no big deal as he calls it "questionable" as all parts of off the shelf and the camshaft itself is one that was from a member on here (358T)...
As my question from the start was Chad's thinking on the 1150 carb atop his motor and what we're his thougths on wether or not the bigger carb was gonna do with torque in this motor at the track and not on a dyno.. :wink:
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Postby jmarkaudio » Tue Jul 28, 2009 10:59 pm

I think it will make more peak torque. Mine made as much torque with the 1250 as the 1050 did 1000 RPM BELOW peak torque and started making more than the 1050 after that. Obviously there is a point of diminishing returns when the heads are a restriction, Chad has said the PR area has been welded, I wouldn't be afraid to try a 1250 on it if it were mine. Would you question it if he put a pair of 650's on it? Nothing ventured...
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Postby SStrokerAce » Wed Jul 29, 2009 7:37 am

Chad Speier wrote:
SStrokerAce wrote:
Chad Speier wrote:Yep, shitty is a nice word for it! All my internet friends who race in "good" air have NO IDEA what it's like! NONE, ZERO, NADA...

Yes standard cam tunnel. My "main" goal was enough to avoid choke. And I hear you on more lift. This started out as a "shelf" build. I wanted to use shelf type components.


Well rocker arms are shelf parts!

Besides all roller cams are shelf parts!


True, but I'm going to use a Mahle Powerpak and I'm not sure I'll have any compression if I have to cut the valve reliefs. I did mow the combustion chamber down. Although the cam is 112...


Chad,

Which pistons the 4cc or 11cc Domes?

Actually I would be more MUCH MORE worried about the exhaust clearance than the intake with the right combination on the cam and rockers....

Bret
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Postby Chad Speier » Wed Jul 29, 2009 7:44 am

Bret, they are the +4cc dome. The chamber is currently at 58cc..

OK. My thoughts on carbs. If it hurts torque, so what? I come from a place that gear moves a car. As far as a dominator, it will make flatter broader power.

Like I said, 5000 DA changes things. I don't think it's possible to get enough carb in 90% humidity...

And.. If my 4 cylinder got a dominator, so will my 406 :lol:
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Postby SStrokerAce » Wed Jul 29, 2009 9:03 am

How deep are the pockets? How much free drop do you have after milling on the intakes and exhausts?

You need about .260" on the intake and .300" on the exhaust TOTAL is what I would guess to run all the cams.

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Postby Chad Speier » Wed Jul 29, 2009 9:14 am

The piston comes -.250 both

The intake is currently flush and exhaust is -.100 from deck. I might be OK on the exhaust?

I figured the exhaust would be the issue with these pistons..
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Postby SStrokerAce » Wed Jul 29, 2009 11:16 am

You might have to trim them a little to get the clearance you need but it's not going to be major. I don't think it will hit the way it sits but you never know till you check!
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Postby Chad Speier » Wed Jul 29, 2009 11:18 am

What is your experience with gas porting this type of piston with a 1.5 top ring? I was going to send them off and have it done. Vacuum pump BTW..
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Postby SStrokerAce » Wed Jul 29, 2009 12:06 pm

Chad Speier wrote:What is your experience with gas porting this type of piston with a 1.5 top ring? I was going to send them off and have it done. Vacuum pump BTW..


I wouldn't bother if anything I would rather losen up the ring drag on the oils with a fish scale.....

EDIT.... it's not because I don't think gas porting doesn't work, it does if you build things around that. It's just that the pistons were designed to be run without it, and the chucking in the machine to do this well is not easy AFTER the piston is done.
Last edited by SStrokerAce on Tue Aug 04, 2009 2:28 pm, edited 1 time in total.
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Postby nhrarody » Fri Jul 31, 2009 7:38 am

Nice intelligent conversation, I like that!

Chad, I like how this forum is so under control..
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Postby trmnatr » Wed Aug 19, 2009 8:57 pm

Chad Speier wrote:Yes glide. This car weighs 1300 with me in it. That changes everything.

Look at the cams in the new RM engines. This is small.

FYI, I'm going to make it make peak at 7-7300.

And I'll tell you how, if it works :wink: :lol:


We have a 5200rpm stall and shift @ 6000rpm with a stock 400 with stock 327 heads ith bowl port and runs 10.40's all day long @ 2800 pounds
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Postby nhrata » Thu Aug 20, 2009 6:34 am

On my old 406 I ran two prc 8896 Dominators and it worked very .. new 434 has one Bigs 1250 stage 9 dominator on it . It made 17 more hp then a 1050 BG
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Postby Scott Smith » Thu Aug 20, 2009 11:44 am

and the chucking in the machine to do this well is not easy AFTER the piston is done.


I think Rebco has a handle on that and they are in Chad's back yard. :wink:
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Postby axegrinder » Sat Aug 22, 2009 8:08 am

Chad Speier wrote:Got the cam today. Here are the specs:

INT open: 28
EXH open: 78
INT close: 66
EXH close: 28

Duration at .020 308 INT, 324 EXH

Duration at .050 275 INT, 286 EXH

112 Lobe Seperation, 109 intake center line


Chad, I like your cam choice. Ive done similar motors with just a tad more duration and a little more area through the pushrod that peaked at 7350 to 7400rpm. All with 112 lobe sep. I tryed one cam at 109 lobe sep and it did not like it.

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Postby Chad Speier » Sat Aug 22, 2009 8:16 am

axegrinder wrote:
Chad Speier wrote:Got the cam today. Here are the specs:

INT open: 28
EXH open: 78
INT close: 66
EXH close: 28

Duration at .020 308 INT, 324 EXH

Duration at .050 275 INT, 286 EXH

112 Lobe Seperation, 109 intake center line


Chad, I like your cam choice. Ive done similar motors with just a tad more duration and a little more area through the pushrod that peaked at 7350 to 7400rpm. All with 112 lobe sep. I tryed one cam at 109 lobe sep and it did not like it.

Denis


Denis, this head since this post has seen a welder 8) .550 offset rocker, Trend tapered pushrods, and 2.80 in².. Right now anyway :lol:
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