Walde's -86 L98
- Thread starter Walde
- Start date
Re: Walde's L98
not a great deal different from the Crower cam you've selected INDYCARS but Id bet the crower version in that application would make very similar or possibility slightly more mid rpm hp as its got a bit more lift, but remember different compression ratio, displacement ,heads, intakes , the port and runner length and cross sectional area and the design of the headers, and how well they scavenge,at any set rpm band, all effect the results so its not like the two engines will be virtual clones
I HAVE used that 00471 in several 383-406 sbc engines (usually but not always with 1.6:1 ratio roller rockers)and in every case it made impressive power up to about 6300 rpm
not a great deal different from the Crower cam you've selected INDYCARS but Id bet the crower version in that application would make very similar or possibility slightly more mid rpm hp as its got a bit more lift, but remember different compression ratio, displacement ,heads, intakes , the port and runner length and cross sectional area and the design of the headers, and how well they scavenge,at any set rpm band, all effect the results so its not like the two engines will be virtual clones
I HAVE used that 00471 in several 383-406 sbc engines (usually but not always with 1.6:1 ratio roller rockers)and in every case it made impressive power up to about 6300 rpm
Re: Walde's L98
The scan is very easily readable, so no problem for me there. It's not like I'm trying to read a book.
The advertised duration is within one degree, but Crower does not state at what lift they rate this duration,
where CompCams tells us its done at 0.006". If we assume the same spec, then the "Hydraulic Intensity" is
also very close .
When looking at the duration at .050", CompCams gives the exhaust 2 more degrees. Also the valve lift of
the CompCams gives a signification nod to the exhaust with another .020" more lift, where the Crower only
adds another .005" of lift.
If the Crower was retarded 4 degrees, then the valve timing for the intakes would be identical and the exhaust
would be within one degree. The Lobe Separation Angle (LSA) would be identical and so would the
Intake Centerline Angle (ICA).
You do have better flowing heads and another 26 cubic inches to feed.
The scan is very easily readable, so no problem for me there. It's not like I'm trying to read a book.
The advertised duration is within one degree, but Crower does not state at what lift they rate this duration,
where CompCams tells us its done at 0.006". If we assume the same spec, then the "Hydraulic Intensity" is
also very close .
When looking at the duration at .050", CompCams gives the exhaust 2 more degrees. Also the valve lift of
the CompCams gives a signification nod to the exhaust with another .020" more lift, where the Crower only
adds another .005" of lift.
If the Crower was retarded 4 degrees, then the valve timing for the intakes would be identical and the exhaust
would be within one degree. The Lobe Separation Angle (LSA) would be identical and so would the
Intake Centerline Angle (ICA).
You do have better flowing heads and another 26 cubic inches to feed.
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Re: Walde's L98
From the picture the manifold looks to be the same as I have, a RPM Air Gap dual plane manifold.
I wonder if the small difference with the larger headers is due to the increase flow from the camshaft, what do you think?
Uh.....I think the CompCams is a Hydraulic Roller.grumpyvette said:
From the picture the manifold looks to be the same as I have, a RPM Air Gap dual plane manifold.
Walde said:
I wonder if the small difference with the larger headers is due to the increase flow from the camshaft, what do you think?
Re: Walde's L98
I think your correct, its a hydraulic roller, (Ill correct that post) I don,t know why I thought I remembered that grind as a solid roller?
I think your correct, its a hydraulic roller, (Ill correct that post) I don,t know why I thought I remembered that grind as a solid roller?
Re: Walde's L98
Greetings after a lengthy hibernation or such.
Car's been sitting for two years now and haven't even touched it this year. Bought an -89 MR2 in January or so and have been having fun with that all year. Cracking little gem.
Anyway, we went into garage today and managed to do something. :idea:
Plan is to change all bushings etc. on the rear lump while it is off. Probably would be good idea to change half and shaft seals, too.
Greetings after a lengthy hibernation or such.
Car's been sitting for two years now and haven't even touched it this year. Bought an -89 MR2 in January or so and have been having fun with that all year. Cracking little gem.
Anyway, we went into garage today and managed to do something. :idea:
Plan is to change all bushings etc. on the rear lump while it is off. Probably would be good idea to change half and shaft seals, too.
Re: Walde's L98
Id think its a good time to change rear differential fluid and replace the U-joints if those were not recently done also
Walde said:Greetings after a lengthy hibernation or such.
Car's been sitting for two years now and haven't even touched it this year. Bought an -89 MR2 in January or so and have been having fun with that all year. Cracking little gem.
Anyway, we went into garage today and managed to do something. :idea:
Plan is to change all bushings etc. on the rear lump while it is off. Probably would be good idea to change half and shaft seals, too.
Id think its a good time to change rear differential fluid and replace the U-joints if those were not recently done also
Re: Walde's L98
And now for something completely different.
I have a full set of Timken hubs waiting to be installed. Somewhere I read that "you must change the washer behing the rear hub when changing the hubs". Is this so or is the washer re-useable?
The washer is GM P/N 14076924 and according to GMPartsdirect discontinued. Should I replace it or does it matter? Is yes then where might I get them? The ones in there now are OK just a bit of coating (teflon?) is worn off.
And now for something completely different.
I have a full set of Timken hubs waiting to be installed. Somewhere I read that "you must change the washer behing the rear hub when changing the hubs". Is this so or is the washer re-useable?
The washer is GM P/N 14076924 and according to GMPartsdirect discontinued. Should I replace it or does it matter? Is yes then where might I get them? The ones in there now are OK just a bit of coating (teflon?) is worn off.
Re: Walde's L98
looks more like the point where you start cleaning parts , flipping thru catalogs, and getting on the phone and listening to your check book scream in agony as you cut the balance into little bloody chunks ordering parts
looks more like the point where you start cleaning parts , flipping thru catalogs, and getting on the phone and listening to your check book scream in agony as you cut the balance into little bloody chunks ordering parts
Re: Walde's L98
Right. I really should go to garage but I'm feeling lazy. The only thing that is left to correct that is to have some motivational music. For this instance I use music from epic costume drama Rocky Eins und Zwei.
Problem with Gonna Fly Now is that when you plan to go to the garage you get the urge to drink five raw eggs and go running. :shock:
Bill Conti: Gonna Fly Now (Theme from Rocky)
Listening the Overture has the drawback that you want to listen all 8:43 of it and you miss the garage. Anyway, 4:50 works everytime ie. sends shivers down the spine.
Bill Conti: Overture (Main Rocky Song)
Okey, where's them eggs, I'm going running.
Right. I really should go to garage but I'm feeling lazy. The only thing that is left to correct that is to have some motivational music. For this instance I use music from epic costume drama Rocky Eins und Zwei.
Problem with Gonna Fly Now is that when you plan to go to the garage you get the urge to drink five raw eggs and go running. :shock:
Bill Conti: Gonna Fly Now (Theme from Rocky)
Listening the Overture has the drawback that you want to listen all 8:43 of it and you miss the garage. Anyway, 4:50 works everytime ie. sends shivers down the spine.
Bill Conti: Overture (Main Rocky Song)
Okey, where's them eggs, I'm going running.
Re: Walde's L98
Fuel pump
I have no idea how old the installed pump is and as I do not wish to get into possible trouble with it I'd like to replace/upgrade it.
In dyno this 383 made about 460 hp with Performer RPM and 750 carb - we had no possibility to run the engine with EFI.
I have been looking at this Racetronix package: http://www.racetronix.com/RX-C4369-FPKG-2.html
Two items:
Fuel pump with custom installation kit RX-C469-FPA. This has Walbro GSS340M 255L/Hr pump.
and
Fuel pump harness upgrade system RX-C43-FPWHG-2
This package looks to me as it would have all the necessary parts - maybe even more.
As I have no experience of these do you think these would suit my needs or should I look elsewhere?
Fuel pump
I have no idea how old the installed pump is and as I do not wish to get into possible trouble with it I'd like to replace/upgrade it.
In dyno this 383 made about 460 hp with Performer RPM and 750 carb - we had no possibility to run the engine with EFI.
I have been looking at this Racetronix package: http://www.racetronix.com/RX-C4369-FPKG-2.html
Two items:
Fuel pump with custom installation kit RX-C469-FPA. This has Walbro GSS340M 255L/Hr pump.
and
Fuel pump harness upgrade system RX-C43-FPWHG-2
This package looks to me as it would have all the necessary parts - maybe even more.
As I have no experience of these do you think these would suit my needs or should I look elsewhere?