Walt great job on picking the cam specs really like the 108 lsa. thanks for posting that link too. The other one was Pem racing with the solid lifter cam 236- 242 at .050 duration on a 110 lsa. AMS with the roller cam had 409 hp - 540 tq and Pem had 430 hp and 520 tq with the solid cam
Found this, I guess it it the same car as the video with the music. There is still another road drive video of this car I can't find.. I like the idle.
sounds good. looks like he put it in drive and still the idle was good didn't seem like to big of a lope. hard to tell the actual idle sound of the cam with the chambered mufflers
Its running power brakes too but don't know if that was a possible issue with the Ta25 cam? The idling jab of the throttle seems decently crispy I think? True hard to tell with those mufflers.. I'm on a losing mission trying to find the backroad video with more info on the engine upgrades I think you made your mind up though choosing a cam with all the members help.
just seen the lifters there not the edm there part # 800-16. cheap insurance only down side 1-2 lb of oil pressure at idle.
it's written out there about Buick engineers designing aggressive cams to help the nail heads performance.
I knew you would like it! After all, I based my decision largely on a bunch of your old posts. 8ad-f85 made a good argument for tight lobe spacing, and David Vizard's infamous '128 rule' calculates out to a super tight 105* lobe spacing! I'm not brave enough to go that far, if even possible with existing cam cores. I built the 425 in my blue gs (with big Isky cam) when I was a kid in '79. It's been fun but not the best match for a 62 year-old me. A nice cruiser with good low-mid power fits my driving style better. Better for the area roads too. With area tracks Englishtown and Atco now closed, 1/4 mile performance isn't the goal anymore. I just want to have fun. The TA-25 sounded about right, but Comp offers more aggressive designs with good drive-ability (idle/vacuum). Downside is it'll need adjustable rockers or custom length pushrods. I have to decide on valve springs too. Comp said 115-125 seat and 355-370 open . But I shouldn't need that for 5500 rpm? Comp will make my cams in January. I can put them in a spare block and profile them to see how they compare to my other cams. Maybe I'll have a drive report by Spring/Summer.
no way with the 355-370 open unless that was a typo.ta- stage 2 springs with a .030 shim or the stage 3 springs will work fine. you will need both adjustable rocker arms and custom push rods. not to late to change your order can always get one hyd and one solid . i thought you had adjustable rockers on the blue car.
I still have stock rockers on the blue 66 w/Isky inner springs and alum retainers. I'll swap them out after cam break-in for springs and Tom's RR and pushrods for approx 1.6 ratio. Comp spec for the bigger 230-236 solid cam is 0.522 and 0.536 lift. I'll have to see if there's enough retainer-guide clearance for the extra lift. I do have some iron adj 1.5 rockers here too if I want less lift. Nothing is easy! I did a bowl blend on the heads back then, nothing major. Isky cam is 244 dur and 0.440" lift. The new cam will be a big change.
have to minus the lash from the cam card lift so really 0.510 and 0.524 if your cam card has 0.12 hot lash. after a lot of trial and error this is what i found always minus 0.04 from hot lash. 0.09 cold lash will equal 0.12 hot lash. Carmen sold me valve springs with 120-125 on the seat and 275-280 open they worked fine in my 224-230 solid. twice i took it to 6200-6300 rpms to see how it pulled and to check for valve float with no problems.
was wondering what the difference is for a boat cam. was reading if you have too much overlap it can cause water reversion in the exhaust. reversion is water sucking back into the engine at idle. so they put the cam on a wider lsa like a 114 lsa for a better idle. the only difference is the wider lsa.
I honestly have no idea only it was suggested to him by Balchowsky back in the day, and was origionally a Chevy big block grind.
[/QUOTE[/QUOTE] it's ground on comp's tight lash lobes so it's a pretty fast ramp grind not bad really but they put it on a 114 lsa for the better idle and might be costing 20-25 horsepower. wonder what the desktop dyno shows.
It shows it actually performing less than the 114 LSA. These results are really skewed by the use of manifolds and 0 advance install. . - first one is 114 now the 110
I haven't been able to figure out how to compare Comp's hyd cams to their solids using Dyno 2003. A hyd XE 262H cam has 218/224 duration at 0.050" A solid XS 256S cam also has 218/224 duration at 0.050"..... and likely has the same valve open/close specs as the hyd cam. But the solid cams have quite a bit less advertised duration, 256 vs 262. My best guess: The 0.050" duration specs determine the cam's characteristics as to power range. A solid cam has tighter advertised duration, meaning better idle and more vacuum. A solid would have faster ramps, therefore 'more area under the curve' for better power. But Comp contradicts my theory, they categorize them by advertised duration: XS 256S solid and XE 256H hyd are both described as 'Strong torque thru low and mid range, good idle'. But the solid has more 050 duration vs the hyd, 218/224 vs 212/218 for the hyd. So how do we compare a solid vs hyd that have the same 050 points? Adjust the ramp rate? to what? Comp doesn't publish both 050 and adv valve events, so we have to guess.
