70 LT1hi-rpm better but still not there

[adam schorr]

As per suggestions made earlier here:

https://www.ncrs.org/forum/archive23.cgi?review=194780

To address 5,200 rpm hi-rev problem, I installed the hi performance rotor from Accell.

Better results:
Obtained another 1,000 rpm...From 5,200 to a higher 6,200.

But, the car still has hi-rev issue at 6,200, and stops pulling with a mild backfire out the exhaust.

I cannot trust former mechanic. It's questionable if he EVER actually installed the TI amplifier upgraded circuit board purchased from TI Speciaties.

The same mechanic installed (AC delco?) service replacement rotor and cap.

Questions:
Could the NOT correct service replacement cap might be an issue?
Who sells correct Delco Remy replacement distributor caps?
Could the TI amplifier be contributing to rev limit?

The wires looked fine.

[Craig S.]

Re: 70 LT1hi-rpm better but still not there

At 6200 rpm you may be running into valve float depending on age and condition of valve springs.......Craig

[adam schorr]

Re: 70 LT1hi-rpm better but still not there

Car pulled strong to 6,500 red-line ~no problem~ Spring 2005. Former mechanic recently created problems instead of fixing.
Craig, sorry, didn't want to repost everything discussed in earlier discussion. A good suggestion. Thanks, but think it's something else.

[Duke W.]

Re: 70 LT1hi-rpm better but still not there

The single point/TI distributor caps (except 63-65 FI) are interchangeable from '57 to '74 - minor changes over the years and some "premium" versions, such as the brown cap used on L-88s, but nothing major from a functional standpoint.

Delco has not manufactured any old distributor replacement parts for probably at least 10 years. Delco is now nothing more than a marketing/distribution organization that purchases parts from independent manufacturers in "Delco" packaging. Most of the old Delco plants were spun off as the core of Delphi, and some were included with the "new" Delco-Remy that is now privately held.

Most of the "big three" captive and independent parts suppliers/aftermarket brands have been gobbled up by either Dana or Federal Mogul over the last 15 years. F-M is in Chapter 11 and Delphi is said to be close. Dana's stock took a huge hit a couple of months ago when they were forced to restate earings. (Half the auto parts and airline industries are in Chapter 11 or rumored to be close, but don't worry, the economy is doing fine. )

During the nineties Dana bought the Echlin, Niehoff, and BWD (Borg Warner) brands, which formed the core of Dana Controls. Of the old "name brands" only Standard Motor Products (Blue Streak is their premium line) was independent.

Then in 2003 Dana sold Dana Controls to Standard, so guess what? Basically all of these brands are now the same part. The only difference is packaging and distribution.

Bottom line: There are no "correct" Delco parts available, but if you buy any of the old time replacement brands you are probably getting a decent functional replacement. I'm actually somewhat suspicious of the origin of some (if not all) current Delco parts, since their source is unclear, and I would prefer buying Echlin, BWD, or Standard because at least I know where they are sourced.

I don't think your cap and rotor are the problem, but check your receipts to see what "brand" they are and any codes or logos on the parts that might aid in identifying their source.

I suspect your engine also needs a decent valve lash adjustment. A special procedure is required. If you e-mail me I will send you the instrution document.

Also suggest that you disconnect all the TI connnectors and carefully check them for cleanliness and good contact.

Duke

[Paul Reynolds]

Re: 70 LT1hi-rpm better but still not there

I had a similar situation many years ago.... too much timing advance at high rpm's. Check the stop bushing on the centrifugal weight plate for excessive wear or maybe it's missing.

[Craig S.]

Re: 70 LT1hi-rpm better but still not there

Adam - not a problem.......I missed your previous thread