Search found 2046 matches
- Sat Mar 23, 2024 9:47 pm
- Forum: Engine Tech
- Topic: Ported Chevy 083 heads, the tpi project
- Replies: 398
- Views: 40767
Re: Ported Chevy 083 heads, the tpi project
I'd be focusing on intake opening and closing points, not the resultant LSA that's still dependant on your chosen exhaust events. That’s how it’s done but I’m still curious as to what makes some of these TPI cars peak at 4900. Others peak at 5900. That to me is telling me there’s something that’s n...
- Tue Feb 06, 2024 11:27 am
- Forum: Engine Tech
- Topic: .842 solid roller lifter needle or bushed??
- Replies: 22
- Views: 1626
Re: .842 solid roller lifter needle or bushed??
I ruined a set of morel lifters in my bbc on the street running near 300 seat 800 open. .842 needles. I was gonna go bushed but changed cam lobes and spring package to take over half the load off and been fine so far ever since. I was told with that much spring load you are goin to get a failure wit...
- Sat Jan 20, 2024 9:41 pm
- Forum: Engine Tech
- Topic: LS Valve weight VS spring pressure
- Replies: 94
- Views: 5427
Re: LS Valve weight VS spring pressure
Agree, it's just significantly less consequential, than what's on the valve side of the rocker fulcrum Regardless of rocker ratio It's still inertial mass that needs to be accounted for. The old "rev kits" that had springs in the valley acting on the lifter took a lot of load off the valv...
- Fri Jan 19, 2024 9:38 pm
- Forum: Engine Tech
- Topic: Why 4 degrees?
- Replies: 159
- Views: 8789
Re: Why 4 degrees?
Ive had some turbo cams straight up or 1-2 deg advanced, and one 3.5 deg.
Had one tight lsa sbc cam with 1 deg advance. 108 icl 109 lsa.
Seems like icl is chosen based on desired events
Had one tight lsa sbc cam with 1 deg advance. 108 icl 109 lsa.
Seems like icl is chosen based on desired events
- Fri Jan 19, 2024 9:42 am
- Forum: Engine Tech
- Topic: LS Valve weight VS spring pressure
- Replies: 94
- Views: 5427
Re: LS Valve weight VS spring pressure
Give JHE a call and see what they think
- Thu Jan 04, 2024 8:14 am
- Forum: Engine Tech
- Topic: Vortecs on a 305?
- Replies: 13
- Views: 36132
Re: Vortecs on a 305?
GM never used a valve larger than 1.85 on the 305 bore, even though they'd made zillions of 1.94 valve cylinder heads previously. Wild guess: A 1.94 valve clears the bore...but is so shrouded that there's no point. There's an ancient Trick Flow 2.02/1.60 head that will similarly clear a 305 bore, a...
- Wed Jan 03, 2024 10:37 am
- Forum: Engine Tech
- Topic: Vortecs on a 305?
- Replies: 13
- Views: 36132
Re: Vortecs on a 305?
They will work. Theres also a 305 vortec head i think its the 059 castings that may be looked into as an alternative
- Mon Jan 01, 2024 8:25 pm
- Forum: Engine Tech
- Topic: 400 dart shp build
- Replies: 40
- Views: 32012
Re: 400 dart shp build
Ive had 11:1 383 run fine on 93. No issues but it was efi and well tuned. Ive had 9:1 400” run fine on pump 93 as well with 24 psi boost lol. 1000 hp. Also efi lol. I think 93 can go along way
- Wed Dec 27, 2023 11:34 pm
- Forum: Engine Tech
- Topic: 400 dart shp build
- Replies: 40
- Views: 32012
Re: 400 dart shp build
“406, less windage, get a good pan, mine has 227 AFR race ready, 10:xx compression, Bullet 255/259 @ .05 cam, Victor Jr, with a Mark Whitener aka jmarkaudio (Lightning Racing Carbs) carb, and made 646hp@ 6800 you have a good block. Just get the rest of the good parts, my combination was from Mike Le...
- Wed Dec 27, 2023 11:30 pm
- Forum: Engine Tech
- Topic: 400 dart shp build
- Replies: 40
- Views: 32012
- Wed Dec 27, 2023 11:25 pm
- Forum: Engine Tech
- Topic: 400 dart shp build
- Replies: 40
- Views: 32012
Re: 400 dart shp build
My buddys 406 made 521 whp thru a t56 6 spd. Trapped 127 mph in a 3300 lb trans am
Ported old afr 195’s that flowed 300 cfm at 208 cc
Single plane efi intake i think a eddy victor efi
Cam i believe was a comp 248/254 solid roller.
10.5:1 roughly. Ran strong for a basic combo
Ported old afr 195’s that flowed 300 cfm at 208 cc
Single plane efi intake i think a eddy victor efi
Cam i believe was a comp 248/254 solid roller.
10.5:1 roughly. Ran strong for a basic combo
- Wed Dec 27, 2023 3:18 pm
- Forum: Engine Tech
- Topic: 400 dart shp build
- Replies: 40
- Views: 32012
Re: 400 dart shp build
Def needs boost if you want it to run with a 509 bbc, although those bbc builds sound mild if running 11’s A typical 11:1 406 with a 250 deg solid roller and afr 220 head approaches 600 hp and runs 10’s in most 3200-3400 cars. Def rowdy idle though although very drivable well tuned. Efi helps alot h...
- Tue Dec 26, 2023 11:46 am
- Forum: Engine Tech
- Topic: 400 dart shp build
- Replies: 40
- Views: 32012
Re: 400 dart shp build
Shp is setup for oem hyd roller setups so you can do the dogbone/gm lifters and step nose cam plate. Else you can do link bar lifters if need much more than .600” lift or so. Should be doable for those power goals
- Mon Dec 04, 2023 9:33 am
- Forum: Engine Tech
- Topic: Rocker System question.
- Replies: 11
- Views: 4631
Re: Rocker System question.
Theres really no reason to get away from stock rocker systems on hyd roller ls stuff. Unless ofcourse its super max effort exceeding the range of lift stock rocker systems are designed around. But you rarely see a hyd roller that big, only solids usually
- Sun Dec 03, 2023 8:20 pm
- Forum: Engine Tech
- Topic: Valve spring properties order of importance
- Replies: 76
- Views: 65729
Re: Valve spring properties order of importance
Ok. So a cam produces a lift curve which is related to velocity and more importantly acceleration rates. Your valve, spring, retainers, and locks have mass. Also your rocker arms. So with mass and acceleration you get a force required. The spring will have that force in terms of rate and total loads...